An Optical and X-Ray Study of the Contact Binary, BH Cassiopeiae
文献类型：期刊论文
| 作者 | Ge,Liang6; Bai,Chunhai6 ; Niu,Hubiao1,6; Zheng,Jie3; Ren,Juanjuan3; Li,Zixi2,6; Liu,Jinzhong6; Zhang,Junbo3,5; Chen,Tingting5,6; Hu,Chin-Ping4
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| 刊名 | Publications of the Astronomical Society of the Pacific
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| 出版日期 | 2019-07-03 |
| 卷号 | 131期号:1002 |
| ISSN号 | 0004-6280 |
| 关键词 | binaries: close binaries: eclipsing binaries: spectroscopic stars: individual (BH Cassiopeiae) stars: variables: general X-rays: binaries |
| DOI | 10.1088/1538-3873/ab247a |
| 英文摘要 | Abstract We present the revised and high-quality CCD time series observations in 2017 and 2018 of the W UMa-type contact binary BH?Cas. The combination of our new determinations of minimum times and those collected from the literatures reveal a long-term period increase with a rate of dP/dt?=?+3.27?×?10?7 day yr?1, which can be accounted for by angular momentum transfer as the less-massive component loses its mass to the more massive one. One cyclical oscillation (A′?=?0.00300 day and P′?=?20.09 yr) superimposed on the long-term period increase tendency is attributed to one additional object that orbits BH Cas. The low-resolution spectra of this source are observed at phase ～0.0 and ～0.5 in 2018 and 2019, and the spectral types are identified as K3V?±?1 and G8V?±?2. According to the luminosity contributions and spectra at these phases, the spectral type of the primary star is close to K3V?±?1. We infer a cool spot on the hotter and less-massive component to fit the asymmetry of light curves. In addition, changes in the location, temperature, and area of spots on the secondary star in different observations may indicate that the magnetic field activity of the secondary is more active than that of the primary. Such strong spot activities and optical flare are both detected at the same time from a W UMa-type star for the first time. With the XMM-Newton observations taken in 2003 and 2012, the X-ray light curve is obtained and the X-ray spectra can be well described with a blackbody or a bremsstrahlung model. The soft X-ray luminosity of BH Cas is estimated as (8.8–9.7)?×?1030 erg s?1. |
| 语种 | 英语 |
| 出版者 | The Astronomical Society of the Pacific |
| WOS记录号 | IOP:0004-6280-131-1002-AB247A |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/2811]  |
| 专题 | 新疆天文台_光学天文与技术应用研究室 光学天文与技术应用研究室_利用南山1米大视场望远镜（NOWT）观测数据的文章 |
| 作者单位 | 1.Department of Astronomy, Beijing Normal University, Beijing 100875, People’s Republic of China 2.College of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi, Xinjiang, 830054, People’s Republic of China 3.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China 4.Department of Astronomy, Kyoto University, Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan 5.University of Chinese Academy of Sciences, Beijing 100049, Beijing, People’s Republic of China 6.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, People’s Republic of China; aliyi@xao.ac.cn, zhy@xao.ac.cn |
| 推荐引用方式 GB/T 7714 | Ge,Liang,Bai,Chunhai,Niu,Hubiao,et al. An Optical and X-Ray Study of the Contact Binary, BH Cassiopeiae[J]. Publications of the Astronomical Society of the Pacific,2019,131(1002). |
| APA | Ge,Liang.,Bai,Chunhai.,Niu,Hubiao.,Zheng,Jie.,Ren,Juanjuan.,...&Liu,Junhui.(2019).An Optical and X-Ray Study of the Contact Binary, BH Cassiopeiae.Publications of the Astronomical Society of the Pacific,131(1002). |
| MLA | Ge,Liang,et al."An Optical and X-Ray Study of the Contact Binary, BH Cassiopeiae".Publications of the Astronomical Society of the Pacific 131.1002(2019). |
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