Journal Article

The orbital periods of AA Dor and NY Vir

D. Kilkenny

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 412, issue 1, pages 487-491
Published in print March 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2010.17919.x
The orbital periods of AA Dor and NY Vir

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New timings of eclipses made between 2000 and 2010 are presented for two binary systems with hot subdwarf primary stars. In the case of AA Dor, an sdOB star with a very cool secondary, the period is found to be constant at a level of about 10−14 d per orbit. In the case of NY Vir, a rapidly pulsating sdBVr with a cool companion, the period is discovered to be decreasing at a rate of −11.2 × 10−13 d per orbit.

Keywords: binaries: eclipsing; stars: individual: AA Dor; stars: individual: NY Vir

Journal Article.  3366 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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