Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aj....135.1757s&link_type=abstract
The Astronomical Journal, Volume 135, Issue 5, pp. 1757-1765 (2008).
Astronomy and Astrophysics
Astronomy
12
Binaries: Eclipsing, Binaries: Spectroscopic, Stars: Evolution, Stars: Fundamental Parameters, Stars: Individual: Gx Geminorum
Scientific paper
We present 12,155 new differential photometric observations in the V filter made with the Undergraduate Research Studies in Astronomy and NF\Observatory WebScopes, as well as 33 radial velocities from spectroscopic observations of the detached, 4.04 day double-lined eclipsing binary star GX Gem. Absolute dimensions of the components are determined from these new, and also from previously published, data with high precision (less than 0.7% in the masses and radii) for the purpose of testing various aspects of theoretical modeling. We obtain 1.488 ± 0.011 solar masses and 2.327 ± 0.012 solar radii for the primary, and 1.467 ± 0.010 solar masses and 2.238 ± 0.012 solar radii for the secondary. The effective temperatures and interstellar reddening of the stars are accurately determined from the spectra, uvbyβ, and UBV photometry: 6195 ± 100 K for the primary, 6165 ± 100 K for the secondary, corresponding to spectral types of F7 and F7 V, and 0.068 mag for the color excess Eb - y . Spectral line widths give rotational velocities that are synchronous with the mean orbital motion in a circular orbit. The components of GX Gem are relatively old main-sequence stars with an age of about 2.8 billion years according to models. Because the components are located right at the end of their main-sequence evolutionary paths, we can place good limits on the convective core overshooting parameter. The lowest value of αov consistent with the observations would appear to be approximately αov = 0.18. Two different theories of tidal synchronization and circularization agree that the components should be synchronously rotating, but disagree about whether or not the orbits should be circular.
Claret Antonio
Sandberg Lacy Claud H.
Torres Guillermo
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