The Evolution of the Supersoft X-Ray Source WX Cen Dominated by Magnetic Wind | |
Zang L(臧蕾)4,5,6; Qian SB(钱声帮)3,4,5,6; Fernández-Lajús,Eduardo1,2 | |
刊名 | The Astrophysical Journal |
2023-02-01 | |
卷号 | 944期号:1 |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/acb52f |
产权排序 | 第1完成单位 |
英文摘要 | WX Cen is most likely one of the Galactic counterparts of compact binary supersoft X-ray sources as a member of the V Sagittae class, in which mass is transferred from a donor secondary to a massive white dwarf primary via an accretion disk. Based on the photometric observations from the TESS space telescope and AAVSO database, 218 times of light minimum were determined. By collecting all available eclipse timings of WX Cen from the literature together with those newly determined, we constructed an O?C diagram and analyzed the variations in the orbital period of the eclipsing binary. It is confirmed that the orbital period is continuously decreasing and the rate of the change in the orbital period is revised to P ? = ? 4.4 ( 4 ) × 10 ? 7 day yr ? 1 = ? 0.038 ( 3 ) s yr ? 1 . The mass of the donor secondary is estimated as M s ~ 0.6?M ⊙, when the white dwarf mass is M WD ~ 0.9?M ⊙. By considering a conservative mass transfer from the secondary to the primary, the orbital period of WX Cen should be increasing, which is opposite to the observed continuous decrease. Therefore, the decrease in the period can be plausibly explained as the result of angular momentum loss (AML) via magnetic wind from the secondary and/or from the accretion disk. The AML causes the donor secondary with a low mass to continually be filling its critical Roche lobe and transferring material to the white dwarf. In this way, the evolution of WX Cen is dominated by the magnetic wind and continuously radiating supersoft X-rays. |
学科主题 | 天文学 ; 恒星与银河系 ; 恒星形成与演化 |
URL标识 | 查看原文 |
语种 | 英语 |
出版者 | The American Astronomical Society |
WOS记录号 | IOP:APJ_944_1_97 |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/25953] |
专题 | 云南天文台_双星与变星研究组 |
通讯作者 | Qian SB(钱声帮) |
作者单位 | 1.Instituto de Astrofísica de La Plata (CCT La Plata—CONICET/UNLP), B1900FWA La Plata, Argentina 2.Facultad de Ciencias Astronómicas y Geofísicas—Universidad Nacional de La Plata, Paseo del Bosque S/N—B1900FWA, La Plata, Argentina 3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District 100012, Beijing, People's Republic of China 4.University of Chinese Academy of Sciences, Yuquan Road 19#, Shijingshan District 100049, Beijing, People's Republic of China 5.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, Yunnan, People's Republic of China 6.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, Kunming 650011, Yunnan, People's Republic of China; qsb@ynao.ac.cn |
推荐引用方式 GB/T 7714 | Zang L,Qian SB,Fernández-Lajús,Eduardo. The Evolution of the Supersoft X-Ray Source WX Cen Dominated by Magnetic Wind[J]. The Astrophysical Journal,2023,944(1). |
APA | Zang L,Qian SB,&Fernández-Lajús,Eduardo.(2023).The Evolution of the Supersoft X-Ray Source WX Cen Dominated by Magnetic Wind.The Astrophysical Journal,944(1). |
MLA | Zang L,et al."The Evolution of the Supersoft X-Ray Source WX Cen Dominated by Magnetic Wind".The Astrophysical Journal 944.1(2023). |
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