GP And: A Possible Alternate O-C Behaviour?

Details GP And: A Possible Alternate O-C Behaviour? GP And: A Possible Alternate O-C Behaviour?

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..335..317p&link_type=abstract

The Light-Time Effect in Astrophysics, Proceedings of ASP Conference Series, Vol. 335, held in Brussels 19-22 July 2004. Edited

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

The study of the pulsation period variability of the HADS star GP Andromedae is resumed on the basis of new CCD times of maximum light. The value of the relative period change rate estimated by us, from the available photoelectric data (57± 11)\cdot 10-9 yr-1 is closer to the predicted value (1.6\cdot 10-9 yr-1 and 2.0\cdot 10-9 yr-1, respectively) than the previous estimates. However, the run of the O-C curve is further on better described by a cubic ephemeris, which suggests the possibility of the existence of an alternate period variation.

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