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题名: LONG-TERM OPTICAL OBSERVATIONS OF THE Be/X-RAY BINARY X PER
作者: Li Hui(黎辉)1, 2; Yan JingZhi(颜景志)1; Zhou, Jianeng1, 2; Liu, Qingzhong1
刊名: ASTRONOMICAL JOURNAL
出版日期: 2014-12-01
卷号: 148, 期号:6, 页码:113
关键词: stars: emission-line, Be ; stars: individual (X Per) ; stars: neutron ; X-rays: binaries
学科分类: 天文和天体物理
DOI: 10.1088/0004-6256/148/6/113
文章类型: Article
英文摘要: We present optical spectroscopic observations of X Per from 1999 to 2013 with the 2.16 m telescope at Xinglong Station and the 2.4 m telescope at Lijiang Station, National Astronomical Observatories of China. Combining these observations with the public optical photometric data, we find certain epochs of anti-correlations between the optical brightness and the intensity of the Ha and He I 6678 lines, which may be attributed to the mass ejections from the Be star; however, alternative explanations are also possible. The variability of the Fe II 6317 line in the spectra of X Per might also be caused by the shocked waves formed after the mass ejections from the Be star. The X-ray activities of the system might also be connected with the mass ejection events from the Be star. When the ejected materials were transported from the surface of the Be star to the orbit of the neutron star, an X-ray flare could be observed in its X-ray light curves. We use the neutron star as a probe to constrain the motion of the ejected material in the circumstellar disk. With the diffusion time of the ejected material from the surface of the Be star to the orbit of neutron star, the viscosity parameter a of the circumstellar disk is estimated to be 0.39 and 0.28 for the different times, indicating that the disk around the Be star may be truncated by the neutron star at the 2:1 resonance radius and that a Type I X-ray outburst is unlikely to be observed in X Per.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: II EMISSION-LINES ; TIMING EXPLORER ; PHASE-CHANGES ; NEUTRON-STAR ; H-ALPHA ; FE-II ; PERSEI ; DISKS ; VARIABILITY ; PHOTOMETRY
收录类别: SCI
语种: 英语
WOS记录号: WOS:000345223200010
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/11564
Appears in Collections:太阳高能及相关物理过程研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Li, Hui; Yan, Jingzhi; Zhou, Jianeng; Liu, Qingzhong.LONG-TERM OPTICAL OBSERVATIONS OF THE Be/X-RAY BINARY X PER,ASTRONOMICAL JOURNAL,2014,148(6):113
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