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Astron. Astrophys. 317, 104-107 (1997)

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Research Note

Apsidal motion in the eclipsing binary OX Cassiopeiae

Marek Wolf 1 and Lenka arounová

1 Astronomical Institute, Charles University Prague, CZ-150 00 Praha 5, védská 8, Czech Republic (e mail: wolf @ mbox.cesnet.cz)
2 Astronomical Institute, University Basel, Venusstrasse 7, CH-4102 Binningen, Switzerland

Received 17 November 1995 / Accepted 14 April 1996


We report several new reliable times of minimum of the eccentric eclipsing binary OX Cas (P = 2.48934 days, e = 0.04, V = 9.92 mag, B2V + B2V). The O-C diagram is analyzed using all precise timings found in the literature and improved values for the elements of the apsidal motion and the internal structure constant are computed. We have found a short period of apsidal motion U = [FORMULA] yr and the internal structure constant [FORMULA] = 0.0060.

Key words: stars: binaries: eclipsing - stars: individual: OX Cas - stars: fundamental parameters

Send offprint requests to: M. Wolf

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© European Southern Observatory (ESO) 1997