Journal Article

Absolute parameters of the eclipsing binary V821 Cas from <i>UBVRI</i> light curves and radial velocities*†

Ö. Çakırlı, C. İbanoǧlu, S. Bilir and E. Sipahi

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 3, pages 1649-1656
Published in print May 2009 | ISSN: 0035-8711
Published online May 2009 | e-ISSN: 1365-2966 | DOI:
Absolute parameters of the eclipsing binary V821 Cas from UBVRI light curves and radial velocities*†

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We present UBVRI photometric measurements and spectroscopic observations of the double-lined eclipsing binary V821 Cas. The radial velocities were obtained by means of the cross-correlation technique. Simultaneous analyses of the multiband light curves and RVs give the absolute parameters for the stars as: and . An analysis of the O–C residuals yielded an apsidal motion in the binary at a rate of , corresponding to an apsidal period of U= 118 ± 19 yr. Subtracting the relativistic contribution, we find that log k2obs=−2.590 which is in agreement with the value predicted by theoretical models. Comparison with current stellar evolution models gives an age of 5.6 × 108 yr for the system.

Keywords: binaries: close; binaries: eclipsing; binaries: general; binaries: spectroscopic; stars: individual: V821 Cas

Journal Article.  4902 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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