新的CCD观测和接触双星的首次光度学研究

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Journal of the Korean Astronomical Society Pub Date : 2016-06-30 DOI:10.5303/JKAS.2016.49.3.65

N. Awadalla, M. Hanna, M. N. Ismail, I. A. Hassan, M. A. Elkhamisy

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引用次数: 0

摘要

我们在VRI波段获得了接触二进制AP - UMi的第一个完整的CCD光曲线(lc)，并利用PHOEBE编码对其进行了分析。采用斑点模型处理LCs中的不对称性。LC的形貌清晰地显示了O 'Connell效应，溶液中也显示了星斑对两组分的影响。这种恒星黑子效应在RS CVn和wuma色球活跃恒星之间很常见。根据得到的LCs解，研究了各组分的演化状态，得出了该系统是一个质量比q = 0.38的前中间接触二元系统(f = 0.29)，是一个质量较小的次级组分比质量较大的初级组分温度较低的a型wuma系统。

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NEW CCD OBSERVATIONS AND THE FIRST PHOTOMETRIC STUDY OF THE CONTACT BINARY AP UMI

We obtain the first complete CCD light curves (LCs) of the contact binary AP UMi in the VRI bands and analyzed them by means of the PHOEBE code. A spotted model is applied to treat the asymmetry in the LCs. The LC morphology clearly shows the O’Connell effect and the solution shows an influence of star spots on both components. Such effect of star spots is common between the RS CVn and W UMa chromospherically active stars. Based on the obtained solution of the LCs we investigate the evolutionary state of the components and conclude that the system is a pre-intermediate contact binary (f = 0.29) with mass ratio q = 0.38, and it is an A-type W UMa system where the less massive secondary component is cooler than the more massive primary one.

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来源期刊

Journal of the Korean Astronomical Society 地学天文-天文与天体物理

CiteScore

1.30

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.