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http://dx.doi.org/10.5140/JASS.2003.20.2.123

PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAE

Lee, Jae-Woo (Department of Astronomy & Space Science, College of National Sciences and Institute of Basic Science Research, Chungbuk National University, Korea Astronomy Observatory)
Kim, Chun-Hwey (Department of Astronomy & Space Science, College of National Sciences and Institute of Basic Science Research, Chungbuk National University)
Han, Won-yong (Korea Astronomy Observatory)
Jin, Ho (Korea Astronomy Observatory)
Oh, Kyu-Dong (Department of Earth Science Education, Chonnam National University)

Publication Information

Journal of Astronomy and Space Sciences / v.20, no.2, 2003 , pp. 123-132 More about this Journal

Abstract

We performed CCD photometric observations of the W-type contact binary AB And for 10 nights from November 1995 to December 1999 using the 61-cm reflector and BVR filters at Sobaeksan Optical Astronomy Observatory. From our observations, the seasonal light curves of AB And for 1995, 1996 and 1999 were completed and 8 new times of minimum light were determined. Newly obtained light curves show that strong light variations occurred in AB And during the past five years. We adopted the 1996 light curves as reference ones and obtained the photometric solutions of them with contact mode in the Wilson-Devinney binary code. Assuming such light variations were produced by the existence of a star spot (or star spots) in the analysis, we derived the system parameters and analyzed the 1995 and 1999 light curves by adjusting only the spot parameters. As the results, we interpreted that those light variations are produced by the simultaneous existence of a hot spot and a cool spot on the secondary. We could infer that the hot spot on the secondary is produced due to mass exchange between the components suggested by Lee (1999).

Keywords

CCD observations; eclipsing binary; AB And; photometric solutions; spots;

Citations & Related Records

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KSCI

PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAE 접촉쌍성 AB Andromedae의 측광해와 흑점모델

PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAE