X-RAY EMISSION FROM MASSIVE STARS IN CYG OB2
X-RAY EMISSION FROM MASSIVE STARS IN CYG OB2
复制标题
CYG OB2 中大质量恒星的 X 射线发射
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
J. Vink
中科院分区：
文献类型：
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作者：
G. Rauw;Y. Nazé;N. Wright;J. Drake;M. Guarcello;R. Prinja;L. W. Peck;J. F. A. Colombo;A. Herrero;H. Kobulnicky;S. Sciortino;J. Vink
We report on the analysis of the Chandra-ACIS data of O, B, and WR stars in the young association Cyg OB2. X-ray spectra of 49 O-stars, 54 B-stars, and 3 WR-stars are analyzed and for the brighter sources, the epoch dependence of the X-ray fluxes is investigated. The O-stars in Cyg OB2 follow a well-defined scaling relation between their X-ray and bolometric luminosities: log L X L bol = − 7.2 ± 0.2 ?> . This relation is in excellent agreement with the one previously derived for the Carina OB1 association. Except for the brightest O-star binaries, there is no general X-ray overluminosity due to colliding winds in O-star binaries. Roughly half of the known B-stars in the surveyed field are detected, but they fail to display a clear relationship between LX and Lbol. Out of the three WR stars in Cyg OB2, probably only WR 144 is itself responsible for the observed level of X-ray emission, at a very low log L X L bol = − 8.8 ± 0.2 ?> . The X-ray emission of the other two WR-stars (WR 145 and 146) is most probably due to their O-type companion along with a moderate contribution from a wind–wind interaction zone.
银河系 WC 恒星光谱分析的恒星参数表明了新的演化序列
DOI：
10.1051/0004-6361/201117830
发表时间：
2012
期刊：
arXiv: Solar and Stellar Astrophysics
影响因子：
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作者：
A. Sander;W.-R. Hamann;H. Todt
通讯作者：
H. Todt