Revision of the photometric parameters of BS Cassiopeiae  

作　　者：Jia-Jia He Sheng-Bang Qian Miloslav Zejda Zdenek Mikulasek 

机构地区：[1]National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China [2]Graduate University of the Chinese Academy of Sciences, Beijing 100049, China [3]Key Laboratory for the Structure and Evolution of Celestial Objects, National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China [4]Institute of Theoretical Physics and Astrophysics, Masaryk University, Kotlarska 2, 611 37 Brno Czech Republic [5]Observatory and Planetarium of J. Palisa, VSB- Technical University, Ostrava, Czech Republic

出　　处：《Research in Astronomy and Astrophysics》2010年第6期569-576,共8页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos 10973037,10903026 and 10778718);the National Key Fundamental Research Project (Grant 2007CB815406);the Yunnan Natural Science Foundation (Nos.2008CD157 and 2009CD122)

摘　　要：Seven charge-coupled device （CCD） photometric times of light minimum of the overcontact binary BS Cas which were obtained from 2007 August to November and one CCD light curve in the R band which was observed on 2007 September 24 and October 15, are presented. It is found that the light curve ofBS Cas has characteristics like a typical EW-type light variation. The light curve obtained by us is symmetric and shows total eclipses, which is very useful for determining photometric parameters with high precision. Photometric solutions were derived by using the 2003 version of the Wilson-Devinney code. It shows that BS Cas is a W-subtype overcontact binary （f = 27.5% ± 0.4%） with a mass ratio of q = 2.7188± 0.0040. The temperature difference between the two components is 190 K. Analysis of the 042 curve suggests that the period of AE Phe shows a long-term continuous decrease at a rate of dP/dt = - 2.45 × 10^-7 d yr^- 1 The long-time period decrease can be explained by mass transfer from the primary to the secondary.Seven charge-coupled device （CCD） photometric times of light minimum of the overcontact binary BS Cas which were obtained from 2007 August to November and one CCD light curve in the R band which was observed on 2007 September 24 and October 15, are presented. It is found that the light curve ofBS Cas has characteristics like a typical EW-type light variation. The light curve obtained by us is symmetric and shows total eclipses, which is very useful for determining photometric parameters with high precision. Photometric solutions were derived by using the 2003 version of the Wilson-Devinney code. It shows that BS Cas is a W-subtype overcontact binary （f = 27.5% ± 0.4%） with a mass ratio of q = 2.7188± 0.0040. The temperature difference between the two components is 190 K. Analysis of the 042 curve suggests that the period of AE Phe shows a long-term continuous decrease at a rate of dP/dt = - 2.45 × 10^-7 d yr^- 1 The long-time period decrease can be explained by mass transfer from the primary to the secondary.

关 键 词：STARS BINARIES close -- stars BINARIES eclipsing -- stars individual BS Cas 

分 类 号：TQ617.4[化学工程—精细化工] P145.2[天文地球—天体物理]