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J/AcA/62/33    OGLE II detached red giant eclipsing binary twins  (Nataf+, 2012)
Detached red giant eclipsing binary twins: Rosetta stones to the Galactic Bulge.
    Nataf D.M., Gould A., Pinsonneault M.H.
   <Acta Astron., 62, 33-65 (2012)>
   =2012AcA....62...33N
ADC_Keywords: Binaries, eclipsing ; Stars, giant

Keywords: Galaxy: bulge - Galaxy: stellar content - binaries: eclipsing


Abstract:
    We identify 34 highly-probable detached, red giant eclipsing binary
    pairs among 315 candidates in Devor's catalog of ∼10000 OGLE-II
    eclipsing binaries. We estimate that there should be at least 200 such
    systems in OGLE-III. We show that spectroscopic measurements of the
    metallicities and radial-velocity-derived masses of these systems
    would independently constrain both the age-metallicity and
    helium-metallicity relations of the Galactic bulge, potentially
    breaking the age-helium degeneracy that currently limits our ability
    to characterize the bulge stellar population.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table12.dat       96      282   OGLE-II identification, coordinates, apparent
                             magnitudes, relative radii and periods for the
                             gold and silver sample RG eclipsing binary
                             pairs identified (tables 1 & 2 of the paper)


See also:
  J/ApJ/628/411 : Identification & analysis of eclipsing binaries (Devor+, 2005)


Byte-by-byte Description of file: table12.dat

   Bytes Format Units   Label   Explanations

       1  A1    ---     S       [GS] Gold or Silver sample
   3-  4  I2    ---     Field   Field number (1)
   6-  9  I4    ---     LCNum   Star number within the field (1)
  11- 12  I2    h       RAh     Right ascension (J2000)
  14- 15  I2    min     RAm     Right ascension (J2000)
  17- 21  F5.2  s       RAs     Right ascension (J2000)
      23  A1    ---     DE-     Declination sign (J2000)
  24- 25  I2    deg     DEd     Declination (J2000)
  27- 28  I2    arcmin  DEm     Declination (J2000)
  30- 33  F4.1  arcsec  DEs     Declination (J2000)
  35- 39  F5.3  mag     V-I     OGLE V-I colour index (2)
  41- 46  F6.3  mag     Imag    OGLE I magnitude (2)
  48- 52  F5.3  ---     R1/a    Radius of small star, in units of semimajor axis
  54- 58  F5.3  ---     R2/a    Radius of large star, in units of semimajor axis
  60- 68  F9.6  d       Per     Orbital period
  70- 74  F5.3  ---     Ecc     Orbital eccentricity
  76- 85  F10.2 d       T0      Epoch for the secondary eclipse (when the
                                 secondary is behind the primary)
  87- 90  F4.2  d       t1      Transit time
  92- 96  F5.3  ---     sini    Sine of inclination

Note (1): The star IDs used here are those from the catalog of Devor
     (2005, Cat. J/ApJ/628/411), <OGLEII DIA BUL-SCNN NNNN> in Simbad. 
     More detailed properties can be found in the catalog of Devor 
     (2005, Cat. J/ApJ/628/411).
Note (2): The original photometry for these sources can be found on the
     OGLE-II archive (Udalski et al. 1997AcA....47..319U; Szymanski et al.
     2005AcA....55...43S).


History:
     From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    10-May-2012