RZ Cha is a detached eclipsing binary containing two slightly evolved F5
stars in a circular orbit of period 2.832 d. We use new light curves from the
Transiting Exoplanet Survey Satellite (TESS) and spectroscopic orbits from Gaia
DR3 to measure the physical properties of the component stars. We obtain masses
Di 1.488 +/- 0.011 Msun and 1.482 +/- 0.011 Msun, and radii of 2.150 +/- 0.006
Rsun and 2.271 +/- 0.006 Rsun. An orbital ephemeris from the TESS data does not
match published times of mid-eclipse from the 1970s, suggesting the period is
not constant. We measure a distance to the system of 176.7 +/- 3.7 pc, which
agrees with the Gaia DR3 value. A comparison with theoretical models finds
agreement for metal abundances of Z = 0.014 and Z = 0.017 and an age of 2.3
Gyr. No evidence for pulsations was found in the light curves. Future data from
TESS and Gaia will provide more precise masses and constraints on any changes
in orbital period.

Questo articolo esplora i giri e le loro implicazioni.

Scarica PDF: