Open AccessThe orbital periods of AA Dor and NY Vir
Author(s) -
Kilkenny D.
Publication year - 2011
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2010.17919.x
Subject(s) - physics , subdwarf , orbital period , astrophysics , orbit (dynamics) , astronomy , stars , orbital elements , binary star , white dwarf , engineering , aerospace engineering
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 sdBV r with a cool companion, the period is discovered to be decreasing at a rate of −11.2 × 10 −13 d per orbit.