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Astron. Astrophys. 345, 553-558 (1999)


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Apsidal motion and light-time effect in the eclipsing binaries RU Monocerotis and DR Vulpeculae

Marek Wolf 1, Roger Diethelm 2 and Lenka arounová 3

1 Astronomical Institute, Charles University Prague, CZ-180 00 Praha 8, V Holeovikách 2, Czech Republic (wolf@mbox.cesnet.cz)
2 Astronomical Institute, University of Basel, Venusstrasse 7, CH-4102 Binningen, Switzerland (diethelm@astro.unibas.ch)
3 Astronomical Institute, Czech Academy of Sciences, CZ-251 65 Ondejov, Czech Republic

Received 1 December 1998 / Accepted 1 March 1999

Abstract

We present a period analysis of the two early-type and well-known eccentric eclipsing binaries RU Mon ([FORMULA]) and DR Vul ([FORMULA]). Several new times of minimum light recorded with photoelectric means have been gathered. The [FORMULA] diagrams are analyzed using all reliable timings found in the literature and new values for the elements of the apsidal motion and light-time effect are computed. We confirmed the very short period of apsidal motion of about 36.3 years for DR Vul. The third bodies have an orbital period of about 73 and 63 years for RU Mon and DR Vul, respectively.

Key words: stars: binaries: eclipsing – stars: fundamental parameters – stars: individual: RU Mon – stars: individual: DR Vul

Send offprint requests to: M. Wolf

© European Southern Observatory (ESO) 1999

Online publication: April 19, 1999

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