J/MNRAS/401/257 Early-type binaries on main sequence (Khaliullin+, 2010)
Synchronization and circularization in early-type binaries on main sequence.
Khaliullin K.F., Khaliullina A.I.
<Mon. Not. R. Astron. Soc., 401, 257-274 (2010)>
=2010MNRAS.401..257K 2010MNRAS.401..257K
ADC_Keywords: Stars, double and multiple ; Photometry ; Morphology ;
Stars, masses
Keywords: binaries: close - binaries: eclipsing - stars: early-type -
stars: evolution - stars: fundamental parameters
Abstract:
We showed in a preceding paper based on an analysis of the observed
rates of apsidal motion that synchronization in early-type eclipsing
binaries continues on the main sequence, and the observed
synchronization times, tsyn, agree with the Zahn's theory
(1977A&A....57..383Z 1977A&A....57..383Z) and are inconsistent with the shorter
time-scale proposed by Tassoul (1987ApJ...322..856T 1987ApJ...322..856T,
1988ApJ...324L..71T 1988ApJ...324L..71T). It follows from this that circularization in
early-type binaries must also proceed in accordance with the Zahn's
theory because the circularization times, tcirc, in both theories
are rather tightly related to tsyn via relation tcirc~αtsyn,
where α is the orbital-to-axial momentum ratio.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 138 101 Physical and geometric parameters of early-type
main-sequence eclipsing binaries
(M1,2>1.6M☉) derived from observational data
table2.dat 88 101 *Physical and geometric parameters of the
eclipsing binaries from Table 1
refs.dat 80 113 References
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Note on table2.dat: inferred by comparing observational data with the
stellar evolutionary models of Claret (2004, Cat. J/A+A/424/919),
and the t/tcirc ratios for these systems computed in terms of
different theories of circularization with the allowance for the
evolutionary variations of the orbital parameters and physical
characteristics of the components.
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See also:
J/A+A/424/919 : Stellar models grids. Z=0.02, M=0.8 to 125 (Claret, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running number
5- 14 A10 --- Name GCVS name
16- 19 I4 --- SB9 ? Star number in the SB9 catalogue
21- 28 F8.5 d Per Orbital period
30- 35 F6.4 --- r1 Fractional radii of the first component in terms
of the semimajor axis a of the relative orbit
37- 42 F6.4 --- r2 Fractional radii of the second component in terms
of the semimajor axis a of the relative orbit
44- 48 F5.2 deg i Inclination of the orbit
50- 55 F6.4 --- e Eccentricity of the orbit as inferred from the
light-curve solution
57- 61 F5.2 solMass M1v ? Mass of the first component as inferred from
an analysis of their radial-velocity curve
63- 67 F5.2 solMass M2v ? Mass of the second component as inferred from
an analysis of their radial-velocity curve
69- 74 F6.3 mag Vmag Outside-eclipse Johnson visual magnitude V
76- 81 F6.3 mag B-V ? Outside-eclipse Johnson visual colour index B-V
83- 88 F6.3 mag U-B ? Outside-eclipse Johnson visual colour index U-B
90- 95 F6.3 mag m1 ? Outside-eclipse Stroemgren colour index m1
97-102 F6.3 mag c1 ? Outside-eclipse Stroemgren colour index c1
104-109 F6.3 mag b-y ? Outside-eclipse visual colour index b-y
111-116 F6.3 mag Jmag ? Outside-eclipse 2MASS visual magnitude J
117-122 F6.3 mag Hmag ? Outside-eclipse 2MASS visual magnitude H
123-128 F6.3 mag Kmag ? Outside-eclipse 2MASS visual magnitude K
129-138 A10 --- Ref References to the principal sources of
photometric and spectroscopic parameters of the
systems, in refs.dat file
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running number
5- 14 A10 --- Name GCVS name
16- 21 F6.3 solMass M1 First component mass (1)
23- 28 F6.3 solMass M2 Second component mass (1)
30- 35 F6.3 solRad R1 First component radius
37- 41 F5.3 solRad R2 Second component radius
43- 48 F6.2 solRad a Semimajor axis of the orbit
50- 54 F5.3 [K] logT1 Effective temperature of first component
56- 60 F5.3 [K] logT2 Effective temperature of second component
62- 65 F4.2 [yr] logt Age of the binary
67- 71 F5.2 [-] log(tc) log(t/tcirc) computed in terms of the Zahn's
theory (1977A&A....57..383Z 1977A&A....57..383Z) (2)
73- 77 F5.2 [-] log(tc)Z log(t/tcirc) computed using modified equation
(14) for Zahn (1977A&A....57..383Z 1977A&A....57..383Z) with
extra coefficients F212(e) and AZ=2 (2)
79- 83 F5.2 [-] log(tc)T log(t/tcirc) computed in terms of the
Tassoul's (1987ApJ...322..856T 1987ApJ...322..856T,
1988ApJ...324L..71T 1988ApJ...324L..71T) theory (2)
85- 88 I4 --- alpha Observed-orbital-to-axial momentum ratio
(Lorb/Lspin)
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Note (1): as inferred by comparing all observational data for the binary
with the evolutionary models of Claret, 2004, Cat. J/A+A/424/919.
Note (2): where tcirc is the circularization time.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ref Reference number
5- 23 A19 --- BibCode BibCode
25- 57 A33 --- Aut Author's name
59- 80 A22 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Apr-2010