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 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), 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 1997AcA....47..319U; Szymanski et al.
2005AcA....55...43S 2005AcA....55...43S).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-May-2012