Apsidal Motion and Physical Parameters of the Eclipsing Binary System AR Cas

Astronomy and Astrophysics – Astronomy

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Scientific paper

Using the four-channel automatic photoelectric photometer of the Sternberg Astronomical Institute’s Tien Shan Mountain Observatory, we have acquired accurate (σobs≈0.004m) W BV R brightness measurements for the eclipsing binary AR Cas during selected phases before eclipse ingress and after egress, as well as at the center of minima. A joint analysis of these measurements with other published data has enabled us to derive for the first time a self-consistent set of physical and geometrical parameters for the star and the evolutionary age of its components, t=(60±3)×106 years. We have found the period of the apsidal motion (U obs=1100±160 years, years-1) and the apsidal parameter of the primary, logk 2,1 obs =-2.41±0.08, with the apsidal parameter being in good agreement with current models of stellar evolution. There is an ultraviolet excess in the primary’s radiation, Δ(U-B)=-0.12m and Δ(B-V)=-0.06m, possibly due to a metal deficiency in the star’s atmosphere.

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