Long-term optical spectral observations of the Be/X-ray binary LSI+61 degrees 303: evidence of H alpha emission associated with the neutron star

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	Long-term optical spectral observations of the Be/X-ray binary LSI+61 degrees 303: evidence of H alpha emission associated with the neutron star
	Liu, QZ 1,2; Hang, HR 1; Wu GJ(吴光节)3 ; Chang, J 1; Zhu, ZX 1
刊名	ASTRONOMY & ASTROPHYSICS
	2000-07
卷号	359 期号:2 页码:646-650
关键词	stars : binaries : close stars : emission-line, Be stars : individual : LSI+61 degrees 303 X-rays : stars
ISSN号	0004-6361
通讯作者	Liu, QZ
产权排序	第三完成单位
英文摘要	We present the optical spectra of the periodic radio star LSI +61 degrees 303 with intermediate dispersion. The H alpha emission line profile and its variation an analyzed. Variability in LSI +61 degrees 303 is observed on different timescales. During our observations the equivalent width (EW) of H alpha line showed long-term variability that is likely to be associated with the 4-year period. We suggest that the long-term variability is connected to the intrinsic behaviour of the Be star. The H alpha EW changed strongly around the radio maximum, clearly displayed a maximum at phases between 0.55-0.6, and possibly both another maximum at phases around 1.0 and a minimum between radio phases 0.7-0.9. The only three spectra that showed nearly equal intensities of the two peaks of H alpha emission line all occurred at radio phases around 0.8. It is interesting to note that the H alpha emission line in 1995 October showed unusual variation at radio phases around 0.6, where the decrease of the H alpha emission accompanied by the enhancement of the emission at the red wing. These short-ten and periodic phenomena can be fairly explained with the X-ray induced H alpha emission by employing the orbital solution deduced from near-infrared Light curves (Marti & Pandes 1995). Thus provides some evidence for a correlation with the orbital motion of the neutron star.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	LSI +61-DEGREES-303 ; RADIO ; VARIABILITY ; MODULATION ; PERIODICITY
收录类别	SCI
原文出处	http://adsabs.harvard.edu/abs/2000A%26A...359..646L
语种	英语
WOS记录号	WOS:000088587000029
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/3997]
专题	云南天文台_其他
作者单位	1.Purple Mountain Observatory, Nanjing 210008, P.R. China, National Astronomical Observatories, Chinese Academy of Sciences 2.Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands 3.Yunnan Observatory, P.O. Box 110, Kunming 650011, P.R. China, National Astronomical Observatories, Chinese Academy of Sciences
推荐引用方式 GB/T 7714	Liu, QZ,Hang, HR,Wu GJ,et al. Long-term optical spectral observations of the Be/X-ray binary LSI+61 degrees 303: evidence of H alpha emission associated with the neutron star[J]. ASTRONOMY & ASTROPHYSICS,2000,359(2):646-650.
APA	Liu, QZ,Hang, HR,Wu GJ,Chang, J,&Zhu, ZX.(2000).Long-term optical spectral observations of the Be/X-ray binary LSI+61 degrees 303: evidence of H alpha emission associated with the neutron star.ASTRONOMY & ASTROPHYSICS,359(2),646-650.
MLA	Liu, QZ,et al."Long-term optical spectral observations of the Be/X-ray binary LSI+61 degrees 303: evidence of H alpha emission associated with the neutron star".ASTRONOMY & ASTROPHYSICS 359.2(2000):646-650.