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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
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) and are inconsistent with the shorter
    time-scale proposed by Tassoul (1987ApJ...322..856T,
    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:

       FileName      Lrecl  Records   Explanations

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

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.


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

   Bytes Format Units   Label     Explanations

   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


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   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) (2)
  73- 77  F5.2  [-]     log(tc)Z  log(t/tcirc) computed using modified equation
                                   (14) for Zahn (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,
                                    1988ApJ...324L..71T) theory (2)
  85- 88  I4    ---     alpha     Observed-orbital-to-axial momentum ratio
                                   (Lorb/Lspin)

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.



Byte-by-byte Description of file: refs.dat

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     Ref       Reference number
   5- 23  A19   ---     BibCode   BibCode
  25- 57  A33   ---     Aut       Author's name
  59- 80  A22   ---     Com       Comments


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    28-Apr-2010