Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003arep...47..551k&link_type=abstract
Astronomy Reports, vol. 47, Issue 7, p.551-561
Astronomy and Astrophysics
Astronomy
3
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.
Khaliullin Kh. F.
Khaliullina A. I.
Krylov A. V.
Mossakovskaya L. V.
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