Photometric Studies of the Contact Binary BV Draconis

Details Photometric Studies of the Contact Binary BV Draconis Photometric Studies of the Contact Binary BV Draconis

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jass...16..227l&link_type=abstract

Journal of Astronomy and Space Sciences, vol. 16, no. 2, p. 227-240.

Astronomy and Astrophysics

Astronomy

Scientific paper

We performed CCD photometric observations of W UMa type contact binary BV Dra during eight nights from May 1996 to June 1999 using 61cm telescope at Sobaeksan Optical Astronomy Observatory, and completed BVR light curves of the system. From our observations, we derived nine new times of minimum lights (five timings for primary eclipse, four for secondary) and determined new light elements with the times of minima observed since 1999. Our BVR light curves and Batten & Lu (1986)'s radial-velocity ones were simultaneously analyzed with contact mode (Mode 3) of Wilson-Devinney's binary model, and the photometric and spectroscopic solutions for BV Dra were solved. In the analysis, we derived the solutions of 1999 light curves with and without spots, respectively. As the results, asymmetry of light curves may be interpreted as produced by the existence of two spots; hot spot on the secondary and cool on the primary. Combining solutions of light curves and radial-velocity ones, absolute dimensions of BV Dra are M1=0.40M , M2=1.01M ,R1=0.72R , R2=0.40R . In mass-radius diagram, the less massive and hotter primary component of BV Dra is near TAMS and the secondary is near ZAMS, which is very similar to the other W-type W UMa binaries.

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