J/AZh/79/738 Population model of binary stars in the Galaxy (Tutukov+, 2002)
A model for the population of binary stars in the Galaxy.
Tutukov A.V., Yungelson L.R.
<Astron. Zh. 79, 738 (2002)>
=2002AZh....79..738T 2002AZh....79..738T
=2002ARep...46..667T 2002ARep...46..667T
ADC_Keywords: Models, evolutionary ; Stars, double and multiple
Abstract:
A comparative study of the population of the galactic binary stars is
performed for two modes of star formation: star formation at a
constant rate over 10+10yrs, and a burst of star formation that
reprocesses the same mass of gas into stars over 10+9yrs. Estimates
are presented for the star formation rates and populations of about
100 types of binaries and the products of their evolution.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 71 82 Close binaries: formation rate, products of their
evolution and counts in various models
table4.dat 69 47 Wide binaries: formation rate, products of their
evolution and counts in various models
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Byte-by-byte Description of file: table1.dat table4.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- System Type of system (1)
7- 27 A21 --- SType Type of star or event (2)
29- 34 E6.2 yr-1 nuA Rate of binary formation in model A (3)
36- 41 E6.2 --- NA ? Number of close binaries for T=1010yrs
in model A
43- 48 E6.2 yr-1 nuB ? Rate of binary formation in model B (4)
50- 55 E6.2 --- NB ? Number of close binaries for T=1010yrs
in model B
57- 62 E6.2 yr-1 nuC ? Rate of binary formation in model C (5)
64- 70 E7.2 --- NC ? Number of close binaries for T=1010yrs
in model C
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Note (1): Type of binary system is designated as follows:
MSS = Main-sequence stars
SBH = Systems with black holes
SNS = Systems with neutron stars
SWD = Systems with white dwarfs
SHS = Systems with helium stars
SDS = Semi-detached systems
CC = Coalescence of components
CE = Common envelopes
TZO = Thorne-Zytkov Objects
CRO = Coalescence of relativistic objects
SN = Supernovae
IAHeL = Ignition of accreted He layer
COND = Collapse of oxygen-neon dwarfs
BH = Black holes
NS = Neutron stars
SGS = Subgiants, giants and supergiants
HS = Helium stars
WD = White dwarfs
Note (2): Type of star or event is designated as follows:
MS = main-sequence star
BH = black hole
XRS = X-ray source
sd = semi-detached system
SG = subgiant (a star with a helium core and hydrogen-burning layer)
ONe = oxygen-neon-carbon white dwarf
CO = carbon-oxygen white dwarf
He = helium white dwarfs
CO* = carbon-oxygen star
R CrB*(CO) = R CrB star with detonating CO-core
R CrB*(ONe) = R CrB star with collapsing ONe core
HCE = system with a hydrogen common envelope
HeCE = system with a helium common envelope
TZ = Thorne-Zytkov objects
G(He) = star in a stage of core He burning,
AGB = star on the asymptotic giant branch
Note (3): Model A:
Continuus star formation over 10+10yrs with a constant rate.
Common-envelope parameter, α=1 Blank entries correspond to cases
when some type of system does not appear in the model at T=10 billion
years
Note (4): Model B:
The star formation is as in a model A, but with α=0.5 Blank
entries correspond to cases when some type of system does not appear
in the model at T=10 billion years
Note (5): Model C:
The star formation occurs during the first 10+9yrs of the Galaxy's
existence, at a constant rate, but exceeding one in the model A by the
factor 10, and with α=1. Blank entries correspond to cases when
some type of system does not appear in the model at T=10 billion years
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Table2. Rate of formation of single black holes via different channels (yr-1).
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Channels |Model_
| A B C
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Disruption of binaries 1.3E-4 1.3E-4 0.0
Coalescence of black holes 1.2E-5 3.8E-5 8.8E-6
Coalescence of neutron stars and black holes 5.8E-5 7.8E-5 1.5E-5
Coalescence of neutron stars 1.5E-4 8.5E-5 3.9E-5
Evolution of the single products of coalescence 1.1E-5 2.0E-5 0.0
Coalescence of black holes with white dwarfs 2.9E-5 5.9E-5 6.3E-6
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Table3. Current rate of formation of single neutron stars in close binaries via
the main channels (yr-1).
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Channels |Model_
| A B C
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Disruption of binaries 3.1E-3 2.4E-4 0.0
Evolution of the single products of coalescence 3.5E-3 5.4E-3 0.0
Coalescence of white dwarfs 9.0E-4 1.3E-4 3.7E-5
Core collapse of R CrB stars 5.3E-4 5.0E-4 0.0
Coalescence of neutron stars with white dwarfs 1.2E-3 7.5E-4 1.2E-4
Coalescence of neutron stars with MS stars 3.9E-4 9.8E-4 0.0
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(End) Veta Avedisova (INASAN) 01-Oct-2002