Rediscussion of eclipsing binaries. Paper XVII. The F-type twin system CW Eridani
arxiv(2024)
摘要
CW Eri is a detached eclipsing binary system of two F-type stars with an
orbital period of 2.728 d. Light curves from two sectors of observations with
the Transiting Exoplanet Survey Satellite (TESS) and previously published
radial velocity data are analysed to determine the system's physical properties
to high precision. We find the masses of the two stars to be 1.568 ± 0.016
Msun and 1.314 ± 0.010 Msun, the radii to be 2.105 ± 0.007 Rsun and
1.481 ± 0.005 Rsun, and the system's orbit to have an eccentricity of
0.0131 ± 0.0007. The quality of the TESS photometry allows the definition
of a new high-precision orbital ephemeris, however no evidence of pulsation is
found. We derive a distance to the system of 191.7± 3.8 pc, a value
consistent with the Gaia DR3 parallax which yields a distance of
187.9^+0.6_-0.9 pc. The measured parameters of both stellar components
are found to be in agreement with theoretical predictions for a solar chemical
composition and an age of 1.7 Gyr.
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