Binary properties

When specifying known properties in a log file record specification record, the property name must be prefixed with the property type. Currently there is a single binary property type available for use: BINARY_PROPERTY.

For example, to specify the property SEMI_MAJOR_AXIS_PRE_COMMON_ENVELOPE for a binary star being evolved in BSE, use:

BINARY_PROPERTY::SEMI_MAJOR_AXIS_PRE_COMMON_ENVELOPE

Following is an alphabetical list of binary properties available for inclusion in log file record specifiers.

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Following is the list of binary properties available for inclusion in log file record specifiers. Binary Properties

CIRCULARIZATION_TIMESCALE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_CircularizationTimescale
Description:	Tidal circularisation timescale (Myr)
Header String:	Tau_Circ

COMMON_ENVELOPE_AT_LEAST_ONCE
Data type:	BOOL
COMPAS variable:	derived from BaseBinaryStar::m_CEDetails.CEEcount
Description:	Flag to indicate if there has been at least one common envelope event.
Header String:	CEE

COMMON_ENVELOPE_EVENT_COUNT
Data type:	INT
COMPAS variable:	BaseBinaryStar::m_CEDetails.CEEcount
Description:	The number of common envelope events.
Header String:	CE_Event_Counter

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DIMENSIONLESS_KICK_MAGNITUDE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_uK
Description:	Dimensionless kick magnitude supplied by user (see option --fix-dimensionless-kick-magnitude).
Header String:	Kick_Magnitude(uK)

DOUBLE_CORE_COMMON_ENVELOPE
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_CEDetails.doubleCoreCE
Description:	Flag to indicate double-core common envelope.
Header String:	Double_Core_CE

DT
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_Dt
Description:	Current timestep (Myr).
Header String:	dT

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ECCENTRICITY
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_Eccentricity
Description:	Orbital eccentricity.
Header String:	Eccentricity

ECCENTRICITY_AT_DCO_FORMATION
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_EccentricityAtDCOFormation
Description:	Orbital eccentricity at DCO formation.
Header String:	Eccentricity@DCO

ECCENTRICITY_INITIAL
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_EccentricityInitial
Description:	Supplied by user via grid file or sampled from distribution (see --eccentricity-distribution option) (default).
Header String:	Eccentricity@ZAMS

ECCENTRICITY_POST_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_CEDetails.postCEE.eccentricity
Description:	Eccentricity immediately following common envelope event.
Header String:	Eccentricity>CE

ECCENTRICITY_PRE_SUPERNOVA
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_EccentricityPreSN
Description:	Eccentricity of the binary immediately prior to supernova event.
Header String:	Eccentricity<SN

ECCENTRICITY_PRE_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_CEDetails.preCEE.eccentricity
Description:	Eccentricity at the onset of RLOF leading to the CE.
Header String:	Eccentricity<CE

ERROR
Data type:	INT
COMPAS variable:	derived from BaseBinaryStar::m_Error
Description:	Error number (if error condition exists, else 0).
Header String:	Error

EVOLUTION_STATUS
Data type:	INT
COMPAS variable:	derived from BaseBinaryStar::m_EvolutionStatus
Description:	Final evolution status (reason binary evolution was stopped). Will be printed as one of: Simulation completed = 1 Evolution stopped because an error occurred = 2 Allowed time exceeded = 3 Allowed timesteps exceeded = 4 No user-provided timesteps read = 5 User-provided timesteps exhausted = 6 User-provided timesteps not consumed = 7 SSE error for one of the constituent stars = 8 Error evolving binary = 9 Time exceeded DCO merger time = 10 Stars touching = 11 Stars merged = 12 Stars merged at birth = 13 DCO formed = 14 Double White Dwarf formed = 15 Massless Remnant formed = 16 Unbound binary = 17
Header Strings:	Evolution_Status

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ID
Data type:	INT
COMPAS variable:	BaseBinaryStar::m_ObjectId
Description:	Unique object identifier for C++ object – used in debugging to identify objects.
Header String:	ID

IMMEDIATE_RLOF_POST_COMMON_ENVELOPE
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.immediateRLOFPostCEE
Description:	Flag to indicate if either star overflows its Roche lobe immediately following common envelope event.
Header String:	Immediate_RLOF>CE

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MASS_1_POST_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BinaryConstituentStar::m_CEDetails.postCEE.mass
Description:	Mass of the primary star immediately following common envelope event (\(M_\odot\)).
Header String:	Mass(1)>CE

MASS_1_PRE_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BinaryConstituentStar::m_CEDetails.preCEE.mass
Description:	Mass of the primary star immediately prior to common envelope event (\(M_\odot\)).
Header String:	Mass(1)<CE

MASS_2_POST_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BinaryConstituentStar::m_CEDetails.postCEE.mass
Description:	Mass of the secondary star immediately following common envelope event (\(M_\odot\)).
Header String:	Mass(2)>CE

MASS_2_PRE_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BinaryConstituentStar::m_CEDetails.preCEE.mass
Description:	Mass of the secondary star immediately prior to common envelope event (\(M_\odot\)).
Header String:	Mass(2)<CE

MASS_ENV_1
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_MassEnv1
Description:	Envelope mass of the primary star (\(M_\odot\)).
Header String:	Mass_Env(1)

MASS_ENV_2
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_MassEnv2
Description:	Envelope mass of the secondary star (\(M_\odot\)).
Header String:	Mass_Env(2)

MASSES_EQUILIBRATED
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_MassesEquilibrated
Description:	Flag to indicate whether chemically homogeneous stars had masses equilibrated and orbit circularised due to Roche lobe overflow during evolution.
Header String:	Equilibrated

MASSES_EQUILIBRATED_AT_BIRTH
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_MassesEquilibratedAtBirth
Description:	Flag to indicate whether stars had masses equilibrated and orbit circularised at birth due to Roche lobe overflow.
Header String:	Equilibrated_At_Birth

MASS_TRANSFER_TRACKER_HISTORY
Data type:	INT
COMPAS variable:	derived from BaseBinaryStar::m_MassTransferTrackerHistory
Description:	Indicator of mass transfer history for the binary. Will be printed as one of: NO MASS TRANSFER = 0 MASS TRANSFER STABLE STAR1 -> STAR2 = 1 MASS TRANSFER STABLE STAR2 -> STAR1 = 2 MASS TRANSFER COMMON ENVELOPE STAR1 -> STAR2 = 3 MASS TRANSFER COMMON ENVELOPE STAR2 -> STAR1 = 4 MASS TRANSFER COMMON ENVELOPE DOUBLE CORE = 5 MASS TRANSFER -> MERGER = 6
Header String:	MT_History

MERGES_IN_HUBBLE_TIME
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_MergesInHubbleTime
Description:	Flag to indicate if the binary compact remnants merge within a Hubble time.
Header String:	Merges_Hubble_Time

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OPTIMISTIC_COMMON_ENVELOPE
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_CEDetails.optimisticCE
Description:	Flag that returns TRUE if a radiative-envelope donor survives the CE (requires --common-envelope-allow-radiative-envelope-survive TRUE).
Header String:	Optimistic_CE

ORBITAL_VELOCITY
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_OrbitalVelocity
Description:	Orbital velocity (\(km s^{-1}\)).
Header String:	Orbital_Velocity

ORBITAL_VELOCITY_PRE_SUPERNOVA
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_OrbitalVelocityPreSN
Description:	Orbital velocity immediately prior to supernova event (\(km s^{-1}\)).
Header String:	Orbital_Velocity<SN

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RADIUS_1_POST_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BinaryConstituentStar::m_CEDetails.postCEE.radius
Description:	Radius of the primary star immediately following common envelope event (\(R_\odot\)).
Header String:	Radius(1)>CE

RADIUS_1_PRE_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BinaryConstituentStar::m_CEDetails.preCEE.radius
Description:	Radius of the primary star at the onset of RLOF leading to the common-envelope episode (\(R_\odot\)).
Header String:	Radius(1)<CE

RADIUS_2_POST_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BinaryConstituentStar::m_CEDetails.postCEE.radius
Description:	Radius of the secondary star immediately following common envelope event (\(R_\odot\)).
Header String:	Radius(2)>CE

RADIUS_2_PRE_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BinaryConstituentStar::m_CEDetails.preCEE.radius
Description:	Radius of the secondary star at the onset of RLOF leading to the common-envelope episode (\(R_\odot\)).
Header String:	Radius(2)<CE

RANDOM_SEED
Data type:	UNSIGNED LONG
COMPAS variable:	BaseBinaryStar::m_RandomSeed
Description:	Seed for random number generator for this binary star. Optionally supplied by user via program option --random-seed; default generated from system time.
Header String:	SEED

RLOF_POST_MT_COMMON_ENVELOPE
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→isCE
Description:	Flag to indicate if the RLOF leads to a common-envelope event
Header String:	CEE>MT

RLOF_POST_MT_ECCENTRICITY
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→eccentricity
Description:	Eccentricity immediately after RLOF.
Header String:	Eccentricity>MT

RLOF_POST_MT_EVENT_COUNTER
Data type:	UNSIGNED INT
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→eventCounter
Description:	The number of times the binary has overflowed its Roche lobe up to and including this episode
Header String:	MT_Event_Counter

RLOF_POST_MT_SEMI_MAJOR_AXIS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→semiMajorAxis
Description:	Semi-major Axis(\(R_\odot\)) immediately after RLOF.
Header String:	SemiMajorAxis>MT

RLOF_POST_MT_STAR1_MASS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→mass1
Description:	Mass (\(M_\odot\)) of the primary immediately after RLOF.
Header String:	Mass(1)>MT

RLOF_POST_MT_STAR2_MASS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→mass2
Description:	Mass (\(M_\odot\)) of the secondary immediately after RLOF.
Header String:	Mass(2)>MT

RLOF_POST_MT_STAR1_RADIUS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→radius1
Description:	Radius (\(R_\odot\)) of the primary immediately after RLOF.
Header String:	Radius(1)>MT

RLOF_POST_MT_STAR2_RADIUS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→radius2
Description:	Radius (\(R_\odot\)) of the secondary immediately after RLOF.
Header String:	Radius(2)>MT

RLOF_POST_MT_STAR1_RLOF
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→isRLOF1
Description:	Flag to indicate whether the primary is overflowing its Roche Lobe.
Header String:	RLOF(1)>MT

RLOF_POST_MT_STAR2_RLOF
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→isRLOF2
Description:	Flag to indicate whether the secondary is overflowing its Roche Lobe.
Header String:	RLOF(2)>MT

RLOF_POST_MT_STAR1_STELLAR_TYPE
Data type:	INT
COMPAS variable:	BaseBinaryStar::m RLOFDetails.propsPostMT→stellarType1
Description:	Stellar type (per [Hurley et al., 2000]) of the primary star immediately after RLOF.
Header String:	Stellar_Type(1)>MT

Note that this property has the same header string as RLOF_POST_MT_STAR1_STELLAR_TYPE_NAME. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

RLOF_POST_MT_STAR1_STELLAR_TYPE_NAME
Data type:	STRING
COMPAS variable:	derived from BaseBinaryStar::m RLOFDetails.propsPostMT→stellarType1
Description:	Stellar type (per [Hurley et al., 2000]) of the primary star immediately after RLOF.
Header String:	Stellar_Type(1)>MT

Note that this property has the same header string as RLOF_POST_MT_STAR1_STELLAR_TYPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

RLOF_POST_MT_STAR2_STELLAR_TYPE
Data type:	INT
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPostMT→stellarType1
Description:	Stellar type (per [Hurley et al., 2000]) of the secondary star immediately after RLOF.
Header String:	Stellar_Type(2)>MT

Note that this property has the same header string as RLOF_POST_MT_STAR2_STELLAR_TYPE_NAME. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

RLOF_POST_MT_STAR2_STELLAR_TYPE_NAME
Data type:	STRING
COMPAS variable:	derived from BaseBinaryStar::m_RLOFDetails.propsPostMT→stellarType1
Description:	Stellar type (per [Hurley et al., 2000]) of the secondary star immediately after RLOF.
Header String:	Stellar_Type(2)>MT

Note that this property has the same header string as RLOF_POST_MT_STAR2_STELLAR_TYPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

RLOF_POST_STEP_STAR_TO_ROCHE_LOBE_RADIUS_RATIO_1
Data type:	DOUBLE
COMPAS variable:	derived from BaseBinaryStar::m_RLOFDetails.propsPostMT→starToRocheLobeRadiusRatio1
Description:	Ratio of star 1 radius to its RL, at the end of the timestep.
Header String:	Radius(1)|RL>step

RLOF_POST_STEP_STAR_TO_ROCHE_LOBE_RADIUS_RATIO_2
Data type:	DOUBLE
COMPAS variable:	derived from BaseBinaryStar::m_RLOFDetails.propsPostMT→starToRocheLobeRadiusRatio2
Description:	Ratio of star 2 radius to its RL, at the end of the timestep.
Header String:	Radius(2)|RL>step

RLOF_PRE_MT_ECCENTRICITY
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→eccentricity
Description:	Eccentricity at the onset of RLOF.
Header String:	Eccentricity<MT

RLOF_PRE_MT_SEMI_MAJOR_AXIS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→semiMajorAxis
Description:	Semi-major Axis (\(R_\odot\)) at the onset of RLOF.
Header String:	SemiMajorAxis<MT

RLOF_PRE_MT_STAR1_MASS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→mass1
Description:	Mass (\(M_\odot\)) of the primary at the onset of RLOF.
Header String:	Mass(1)<MT

RLOF_PRE_MT_STAR2_MASS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→mass2
Description:	Mass (\(M_\odot\)) of the secondary at the onset of RLOF.
Header String:	Mass(2)<MT

RLOF_PRE_MT_STAR1_RADIUS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→radius1
Description:	Radius (\(R_\odot\)) of the primary at the onset of RLOF.
Header String:	Radius(1)<MT

RLOF_PRE_MT_STAR2_RADIUS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→radius2
Description:	Radius (\(R_\odot\)) of the secondary at the onset of RLOF.
Header String:	Radius(2)<MT

RLOF_PRE_MT_STAR1_RLOF
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→isRLOF1
Description:	Flag to indicate whether the primary was overflowing its Roche Lobe on the previous timestep.
Header String:	RLOF(1)<MT

RLOF_PRE_MT_STAR2_RLOF
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→isRLOF2
Description:	Flag to indicate whether the secondary was overflowing its Roche Lobe on the previous timestep.
Header String:	RLOF(2)<MT

RLOF_PRE_MT_STAR1_STELLAR_TYPE
Data type:	INT
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→stellarType1
Description:	Stellar type (per [Hurley et al., 2000]) of the primary star at the onset of RLOF.
Header String:	Stellar_Type(1)<MT

Note that this property has the same header string as RLOF_PRE_MT_STAR1_STELLAR_TYPE_NAME. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

RLOF_PRE_MT_STAR1_STELLAR_TYPE_NAME
Data type:	STRING
COMPAS variable:	derived from BaseBinaryStar::m_RLOFDetails.propsPreMT→stellarType1
Description:	Stellar type (per [Hurley et al., 2000]) of the primary star at the onset of RLOF.
Header String:	Stellar_Type(1)<MT

Note that this property has the same header string as RLOF_PRE_MT_STAR1_STELLAR_TYPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

RLOF_PRE_MT_STAR2_STELLAR_TYPE
Data type:	INT
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→stellarType2
Description:	Stellar type (per [Hurley et al., 2000]) of the secondary star at the onset of RLOF.
Header String:	Stellar_Type(2)<MT

Note that this property has the same header string as RLOF_PRE_MTvSTAR2_STELLAR_TYPE_NAME. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

RLOF_PRE_MT_STAR2_STELLAR_TYPE_NAME
Data type:	STRING
COMPAS variable:	derived from BaseBinaryStar::m_RLOFDetails.propsPreMT→stellarType2
Description:	Stellar type (per [Hurley et al., 2000]) of the secondary star at the onset of RLOF.
Header String:	Stellar_Type(2)<MT

Note that this property has the same header string as RLOF_PRE_MT_STAR2_STELLAR_TYPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

RLOF_PRE_STEP_STAR_TO_ROCHE_LOBE_RADIUS_RATIO_1
Data type:	DOUBLE
COMPAS variable:	derived from BaseBinaryStar::m_RLOFDetails.propsPreMT→starToRocheLobeRadiusRatio1
Description:	Ratio of star 1 radius to its RL, at the beginning of the timestep.
Header String:	Radius(1)|RL<step

RLOF_PRE_STEP_STAR_TO_ROCHE_LOBE_RADIUS_RATIO_2
Data type:	DOUBLE
COMPAS variable:	derived from BaseBinaryStar::m_RLOFDetails.propsPreMT→starToRocheLobeRadiusRatio2
Description:	Ratio of star 2 radius to its RL, at the beginning of the timestep.
Header String:	Radius(2)|RL<step

RLOF_TIME_POST_MT
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→time
Description:	Time since ZAMS (Myr) immediately after RLOF.
Header String:	Time>MT

RLOF_TIME_PRE_MT
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.propsPreMT→timePrev
Description:	Time since ZAMS (Myr) at the onset of RLOF.
Header String:	Time<MT

ROCHE_LOBE_RADIUS_1
Data type:	DOUBLE
COMPAS variable:	calculated on demand
Description:	Roche radius at peripasis of the primary star (\(R_\odot\)).
Header String:	RocheLobe(1)

ROCHE_LOBE_RADIUS_2
Data type:	DOUBLE
COMPAS variable:	calculated on demand
Description:	Roche radius at peripasis of the secondary star (\(R_\odot\)).
Header String:	RocheLobe(2)

ROCHE_LOBE_RADIUS_1_POST_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_CEDetails.postCEE.rocheLobe1to2
Description:	Roche radius of the primary star immediately following common envelope event (\(R_\odot\)).
Header String:	RocheLobe(1)>CE

ROCHE_LOBE_RADIUS_2_POST_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_CEDetails.postCEE.rocheLobe2to1
Description:	Roche radius of the secondary star immediately following common envelope event (\(R_\odot\)).
Header String:	RocheLobe(2)>CE

ROCHE_LOBE_RADIUS_1_PRE_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_CEDetails.preCEE.rocheLobe1to2
Description:	Roche radius of the primary star at the onset of RLOF leading to the common-envelope episode (\(R_\odot\)).
Header String:	RocheLobe(1)<CE

ROCHE_LOBE_RADIUS_2_PRE_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_CEDetails.preCEE.rocheLobe2to1
Description:	Roche radius of the secondary star at the onset of RLOF leading to the common-envelope episode (\(R_\odot\)).
Header String:	RocheLobe(2)<CE

STAR_TO_ROCHE_LOBE_RADIUS_RATIO_1
Data type:	DOUBLE
COMPAS variable:	Calculated using BinaryConstituentStar::m_StarToRocheLobeRadiusRatio
Description:	Ratio of the primary star’s stellar radius to Roche radius (R/RL), evaluated at periapsis.
Header String:	Radius(1)|RL

STAR_TO_ROCHE_LOBE_RADIUS_RATIO_2
Data type:	DOUBLE
COMPAS variable:	Calculated using BinaryConstituentStar::m_StarToRocheLobeRadiusRatio
Description:	Ratio of the secondary star’s stellar radius to Roche radius (R/RL), evaluated at periapsis.
Header String:	Radius(2)|RL

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SEMI_MAJOR_AXIS_AT_DCO_FORMATION
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_SemiMajorAxisAtDCOFormation
Description:	Semi-major axis at DCO formation (AU).
Header String:	SemiMajorAxis@DCO

SEMI_MAJOR_AXIS_INITIAL
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_SemiMajorAxisInitial
Description:	Semi-major axis at ZAMS (AU).
Header String:	SemiMajorAxis@ZAMS

SEMI_MAJOR_AXIS_POST_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_CEDetails.postCEE.semiMajorAxis
Description:	Semi-major axis immediately following common envelope event (\(R_\odot\)).
Header String:	SemiMajorAxis>CE

SEMI_MAJOR_AXIS_PRE_SUPERNOVA
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_SemiMajorAxisPreSN
Description:	Semi-major axis immediately prior to supernova event (AU).
Header String:	SemiMajorAxis<SN

Note that this property has the same header string as SEMI_MAJOR_AXIS_PRE_SUPERNOVA_RSOL. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

SEMI_MAJOR_AXIS_PRE_SUPERNOVA_RSOL
Data type:	DOUBLE
COMPAS variable:	derived from BaseBinaryStar::m_SemiMajorAxisPreSN
Description:	Semi-major axis immediately prior to supernova event (\(R_\odot\)).
Header String:	SemiMajorAxis<SN

Note that this property has the same header string as SEMI_MAJOR_AXIS_PRE_SUPERNOVA. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

SEMI_MAJOR_AXIS_PRE_COMMON_ENVELOPE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_CEDetails.preCEE.semiMajorAxis
Description:	Semi-major axis at the onset of RLOF leading to the common-envelope episode (\(R_\odot\)).
Header String:	SemiMajorAxis<CE

SEMI_MAJOR_AXIS
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_SemiMajorAxis
Description:	Semi-major axis (AU).
Header String:	SemiMajorAxis

Note that this property has the same header string as SEMI_MAJOR_AXIS_RSOL. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

SEMI_MAJOR_AXIS_RSOL
Data type:	DOUBLE
COMPAS variable:	derived from BaseBinaryStar::m_SemiMajorAxis
Description:	Semi-major axis (\(R_\odot\)).
Header String:	SemiMajorAxis

Note that this property has the same header string as SEMI_MAJOR_AXIS. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

SIMULTANEOUS_RLOF
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.simultaneousRLOF
Description:	Flag to indicate that both stars are undergoing RLOF.
Header String:	Simultaneous_RLOF

STABLE_RLOF_POST_COMMON_ENVELOPE
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_RLOFDetails.stableRLOFPostCEE
Description:	Flag to indicate stable mass transfer after common envelope event.
Header String:	Stable_RLOF>CE

STELLAR_MERGER
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_StellarMerger
Description:	Flag to indicate the stars merged (were touching) during evolution.
Header String:	Merger

STELLAR_MERGER_AT_BIRTH
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_StellarMergerAtBirth
Description:	Flag to indicate the stars merged (were touching) at birth.
Header String:	Merger_At_Birth

STELLAR_TYPE_1_POST_COMMON_ENVELOPE
Data type:	INT
COMPAS variable:	BinaryConstituentStar::m_CEDetails.postCEE.stellarType
Description:	Stellar type (per [Hurley et al., 2000]) of the primary star immediately following common envelope event.
Header String:	Stellar_Type(1)>CE

Note that this property has the same header string as STELLAR_TYPE_NAME_1_POST_COMMON_ENVELOPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

STELLAR_TYPE_1_PRE_COMMON_ENVELOPE
Data type:	INT
COMPAS variable:	BinaryConstituentStar::m_CEDetails.preCEE.stellarType
Description:	Stellar type (per [Hurley et al., 2000]) of the primary star at the onset of RLOF leading to the common-envelope episode.
Header String:	Stellar_Type(1)<CE

Note that this property has the same header string as STELLAR_TYPE_NAME_1_PRE_COMMON_ENVELOPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

STELLAR_TYPE_2_POST_COMMON_ENVELOPE
Data type:	INT
COMPAS variable:	BinaryConstituentStar::m_CEDetails.postCEE.stellarType
Description:	Stellar type (per [Hurley et al., 2000]) of the secondary star immediately following common envelope event.
Header String:	Stellar_Type(2)>CE

Note that this property has the same header string as STELLAR_TYPE_NAME_2_POST_COMMON_ENVELOPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

STELLAR_TYPE_2_PRE_COMMON_ENVELOPE
Data type:	INT
COMPAS variable:	BinaryConstituentStar::m_CEDetails.preCEE.stellarType
Description:	Stellar type (per [Hurley et al., 2000]) of the secondary star at the onset of RLOF leading to the common-envelope episode.
Header String:	Stellar_Type(2)<CE

Note that this property has the same header string as STELLAR_TYPE_NAME_2_PRE_COMMON_ENVELOPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

STELLAR_TYPE_NAME_1_POST_COMMON_ENVELOPE
Data type:	STRING
COMPAS variable:	derived from BinaryConstituentStar::m_CEDetails.postCEE.stellarType
Description:	Stellar type name (per [Hurley et al., 2000]) of the primary star immediately following common envelope event. e.g. "First_Giant_Branch", "Core_Helium_Burning", "Helium_White_Dwarf", etc.
Header String:	Stellar_Type(1)>CE

Note that this property has the same header string as STELLAR_TYPE_1_POST_COMMON_ENVELOPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

STELLAR_TYPE_NAME_1_PRE_COMMON_ENVELOPE
Data type:	STRING
COMPAS variable:	derived from BinaryConstituentStar::m_CEDetails.preCEE.stellarType
Description:	Stellar type name (per [Hurley et al., 2000]) of the primary star at the onset of RLOF leading to the common-envelope episode. e.g. "First_Giant_Branch", "Core_Helium_Burning", "Helium_White_Dwarf", etc.
Header String:	Stellar_Type(1)<CE

Note that this property has the same header string as STELLAR_TYPE_1_PRE_COMMON_ENVELOPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

STELLAR_TYPE_NAME_2_POST_COMMON_ENVELOPE
Data type:	STRING
COMPAS variable:	derived from BinaryConstituentStar::m_CEDetails.postCEE.stellarType
Description:	Stellar type name (per [Hurley et al., 2000]) of the secondary star immediately following common envelope event. e.g. "First_Giant_Branch", "Core_Helium_Burning", "Helium_White_Dwarf", etc.
Header String:	Stellar_Type(2)>CE

Note that this property has the same header string as STELLAR_TYPE_2_POST_COMMON_ENVELOPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

STELLAR_TYPE_NAME_2_PRE_COMMON_ENVELOPE
Data type:	STRING
COMPAS variable:	derived from BinaryConstituentStar::m_CEDetails.preCEE.stellarType
Description:	Stellar type name (per [Hurley et al., 2000]) of the secondary star at the onset of RLOF leading to the common-envelope episode. e.g. "First_Giant_Branch", "Core_Helium_Burning", "Helium_White_Dwarf", etc.
Header String:	Stellar_Type(2)<CE

Note that this property has the same header string as STELLAR_TYPE_2_PRE_COMMON_ENVELOPE. It is expected that one or the other is printed in any file, but not both. If both are printed then the file will contain two columns with the same header string.

SUPERNOVA_ORBIT_INCLINATION_ANGLE
Data type:	DOUBLE
COMPAS variable:	derived from BaseBinaryStar::m_ThetaE
Description:	Indicates the inclination angle between the pre-supernova and post-supernova orbits, between [0, \(\pi\)]
Header String:	Supernova_Orbit_Inclination_Angle

SUPERNOVA_ORBIT_INCLINATION_VECTOR_X
Data type:	DOUBLE
COMPAS variable:	derived from BaseBinaryStar::m_OrbitalAngularMomentumVector.xValue()
Description:	x-component of the post-SN orbital AM unit vector in the pre-SN reference frame (with z parallel to preSN orbital AM, and x parallel to the LRL vector)
Header String:	Orbital_AM_Vector>SN_X

SUPERNOVA_ORBIT_INCLINATION_VECTOR_Y
Data type:	DOUBLE
COMPAS variable:	derived from BaseBinaryStar::m_OrbitalAngularMomentumVector.yValue()
Description:	y-component of the post-SN orbital AM unit vector in the pre-SN reference frame (with z parallel to preSN orbital AM, and x parallel to the LRL vector)
Header String:	Orbital_AM_Vector>SN_Y

SUPERNOVA_ORBIT_INCLINATION_VECTOR_Z
Data type:	DOUBLE
COMPAS variable:	derived from BaseBinaryStar::m_OrbitalAngularMomentumVector.zValue()
Description:	z-component of the post-SN orbital AM unit vector in the pre-SN reference frame (with z parallel to preSN orbital AM, and x parallel to the LRL vector)
Header String:	Orbital_AM_Vector>SN_Z

SUPERNOVA_STATE
Data type:	INT
COMPAS variable:	derived from BaseBinaryStar::m_SupernovaState
Description:	Indicates which star(s) went supernova. Will be printed as one of: No supernova = 0 Star 1 is the supernova = 1 Star 2 is the supernova = 2 Both stars are supernovae = 3
Header String:	Supernova_State

SYNCHRONIZATION_TIMESCALE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_SynchronizationTimescale
Description:	Tidal synchronisation timescale (Myr).
Header String:	Tau_Sync

SYSTEMIC_SPEED
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_SystemicVelocity
Description:	Post-supernova systemic (centre-of-mass) velocity (\(km s^{-1}\)).
Header String:	SystemicSpeed

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TIME
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_Time
Description:	Time since ZAMS (Myr).
Header String:	Time

TIME_TO_COALESCENCE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_TimeToCoalescence
Description:	Time between formation of double compact object and gravitational-wave driven merger (Myr).
Header String:	Coalescence_Time

TOTAL_ANGULAR_MOMENTUM
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_TotalAngularMomentum
Description:	Total angular momentum calculated using regular conservation of energy (\(M_\odot AU^2 y^{r−1}\)).
Header String:	Ang_Momentum_Total

TOTAL_ENERGY
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_TotalEnergy
Description:	Total energy calculated using regular conservation of energy (\(M_\odot AU^2 y^{r−1}\)).
Header String:	Energy_Total

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UNBOUND
Data type:	BOOL
COMPAS variable:	BaseBinaryStar::m_Unbound
Description:	Flag to indicate the binary is unbound (or has become unbound after a supernova event).
Header String:	Unbound

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ZETA_LOBE
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_ZetaLobe
Description:	The logarithmic derivative of Roche lobe radius with respect to donor mass for \(q=\frac{Md}{Ma}\) at the onset of the RLOF.
Header String:	Zeta_Lobe

ZETA_STAR
Data type:	DOUBLE
COMPAS variable:	BaseBinaryStar::m_ZetaStar
Description:	Mass-radius exponent of the star at the onset of the RLOF. Calculated differently based on the value of program option --zeta-prescription
Header String:	Zeta_Star