Photometric Study of the Near-Contact Binary CN Andromedae

Details Photometric Study of the Near-Contact Binary CN Andromedae Photometric Study of the Near-Contact Binary CN Andromedae

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jkas...39...25l&link_type=abstract

Journal of the Korean Astronomical Society, vol. 39, no. 1, pp. 25-30

Astronomy and Astrophysics

Astronomy

1

Binaries: Close, Star: Individual (Cn Andromedae), Stars: Mass Transfer

Scientific paper

We completed four color light curves of the near-contact binary CN And during three nights from September to December 2004 using the 61-cm reflector and BVRI filters at Sobaeksan Observatory. We determined four new times of minimum light (two timings for primary eclipse, two for secondary). Newly obtained BVRI light curves and the radial velocity curves from Rucinski et al. (2000) were simultaneously analyzed to derive the system parameters of CN And. We used the semi-detached mode 4 of the 2003-version of the Wilson-Devinney binary model, and interpreted the asymmetry of the light curve by introducing two spots; a cool spot on the primary component and a hot spot on the secondary component. New photometric parameters are not much different from those of Čiček et al. (2005), and it is considered that the system is in the era of broken contact. From the orbital period study with all available timings including our data, we found a continous period decrease with a rate of dot{P}obs = -1.82 × 10-7 d yr-1 that can be explained with two possible mechanisms. We think the most likely cause of the period decrease is a thermal mass transfer from the primary to the secondary component, rather than angular momentum loss due to a magnetic stellar wind.

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