A Period Study of the Near-Contact Binary IR Cassiopeiae

Details A Period Study of the Near-Contact Binary IR Cassiopeiae A Period Study of the Near-Contact Binary IR Cassiopeiae

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56..809z&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.56, No.5, pp. 809-811

Astronomy and Astrophysics

Astronomy

9

Stars: Binaries: Close, Stars: Binaries: Eclipse, Stars: Binaries: Individual (Ir Cassiopeiae)

Scientific paper

The near-contact binary IR Cas was observed in 2003 October. Two new observed times of the primary minimum were derived. All of the available eclipse times, including the new ones, spanning 90 years were analyzed. It was shown that the period change of the system is very complex. A period oscillation with a period of 53.24 years and an amplitude of about 0.0133 days were found, while it undergoes a secular decrease at a rate of dP/dt = -1.18 × 10-7(±0.09)d yr-1. The mechanisms that could explain the period changes and the evolutionary state of the system are discussed.

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