Long-term Period Changes and Brightness Variations for the Deeply Eclipsing Cataclysmic Variable SW Sex
文献类型:期刊论文
作者 | Fang XH(方小慧)1,2,3; Qian SB(钱声帮)1,2,3,4; Han ZT(韩忠涛)1,2,3,5; Wang QS(王琪善)1,2,3 |
刊名 | ASTROPHYSICAL JOURNAL |
出版日期 | 2020-10-01 |
卷号 | 901期号:2页码:8 |
ISSN号 | 0004-637X |
关键词 | Nova-like variable stars Stellar evolution Stellar winds Stellar accretion disks CCD photometry |
DOI | 10.3847/1538-4357/abb1b9 |
产权排序 | 第1完成单位 |
文献子类 | Article |
英文摘要 | SW Sex is a deeply eclipsing cataclysmic variable with an orbital period of 0.1349 days. Based on the new photometric observations together with the data collected in the literature, we find that the orbital period shows a period wiggle from 1980 to 2015, and then decreases severely until 2020, when our observations end. If the oscillation with an amplitude of 0.000973 days and a period of 36.57 yr is due to the presence of a third body, the mass of this component can be determined asM(3)sini ' = 0.014M. Supposing the companion and the central binary are coplanar, its mass would correspond to a giant planet. However, Applegate's mechanism can also provide enough energy to force such variation and more data will distinguish the reason. The rapid decline of the orbital period at a rate of -4.24 x 10(-10)s s(-1)in 2015-2020 cannot be attributed to magnetic braking. Also, Applegate's mechanism fails to produce such a fast decrease. It can be explained as the angular momentum loss caused by a strong disk wind, which declares its existence by synchronizing the period decrease with the brightness increase. In addition, the long-term brightness oscillation with an amplitude of 0.6 mag and a timescale of about 9.7 yr is discovered. This is the first it has been detected for nova-like cataclysmic variables (CVs). It will provide valuable information for understanding the disk activity and the evolution of the CVs. |
学科主题 | 天文学 ; 恒星与银河系 ; 恒星天文学 ; 恒星形成与演化 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
WOS关键词 | COMPTON-HEATED WINDS ; MAGNETIC BRAKING ; ACCRETION DISKS ; SEXTANTIS ; PHOTOMETRY ; EVOLUTION ; CORONAE ; BINARY |
资助项目 | National Natural Science Foundation of China[11933008] ; National Natural Science Foundation of China[11803083] ; Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000576441500001 |
资助机构 | National Natural Science Foundation of China[11933008, 11803083] ; Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences |
源URL | [http://ir.ynao.ac.cn/handle/114a53/23811] |
专题 | 云南天文台_双星与变星研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
通讯作者 | Fang XH(方小慧) |
作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650216 Kunming, People's Republic of China 2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, 650216 Kunming, People's Republic of China 3.University of Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, People's Republic of China 4.Center for Astronomical Mega-Science,Chinese Academy of Science, 20A Datun Road, Chaoyang Distric, Beijing, 100012, People's Republic of China 5.National Astronomical Research Institute of Thailand, Higher Education Science Research and Innovation, 260 Moo 4, T. Donkaew, A. Maerim, Chiangmai, 50180, Thailand |
推荐引用方式 GB/T 7714 | Fang XH,Qian SB,Han ZT,et al. Long-term Period Changes and Brightness Variations for the Deeply Eclipsing Cataclysmic Variable SW Sex[J]. ASTROPHYSICAL JOURNAL,2020,901(2):8. |
APA | Fang XH,Qian SB,Han ZT,&Wang QS.(2020).Long-term Period Changes and Brightness Variations for the Deeply Eclipsing Cataclysmic Variable SW Sex.ASTROPHYSICAL JOURNAL,901(2),8. |
MLA | Fang XH,et al."Long-term Period Changes and Brightness Variations for the Deeply Eclipsing Cataclysmic Variable SW Sex".ASTROPHYSICAL JOURNAL 901.2(2020):8. |
入库方式: OAI收割
来源:云南天文台
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