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• W2029583114 abstract "We present 12,155 new differential photometric observations in the V filter made with the Undergraduate Research Studies in Astronomy and NFObservatory 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, uvby?, 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 ?ov consistent with the observations would appear to be approximately ?ov = 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." @default.
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• W2029583114 date "2008-04-07" @default.
• W2029583114 modified "2023-09-28" @default.
• W2029583114 title "ABSOLUTE PROPERTIES OF THE MAIN-SEQUENCE ECLIPSING BINARY STAR GX GEMINORUM: CONSTRAINTS ON CONVECTIVE CORE OVERSHOOTING" @default.
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• W2029583114 doi "https://doi.org/10.1088/0004-6256/135/5/1757" @default.
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