PROBING WOLF-RAYET WINDS: CHANDRA/HETG X-RAY SPECTRA OF WR 6

被引：19

作者：

Huenemoerder, David P. ^{[1
]}

Gayley, K. G. ^{[2
]}

Hamann, W. -R. ^{[3
]}

Ignace, R. ^{[4
]}

Nichols, J. S. ^{[5
]}

Oskinova, L. ^{[3
]}

Pollock, A. M. T. ^{[6
,7
]}

Schulz, N. S. ^{[1
]}

Shenar, T. ^{[3
]}

机构：

[1] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[2] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[3] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[4] E Tennessee State Univ, Dept Phys & Astron, Johnson City, TN 37614 USA

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[6] European Space Agcy, ESAC, E-28691 Villanueva De La Canada, Spain

[7] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 815卷 / 01期

基金：

美国国家航空航天局;

关键词：

stars: individual (WR 6); stars: massive; stars: Wolf-Rayet; EZ-CANIS-MAJORIS; HELIUM-LIKE IONS; BLANKETED MODEL ATMOSPHERES; MASSIVE ECLIPSING BINARY; RADIATION-DRIVEN WINDS; O-TYPE STARS; STELLAR WINDS; LINE-PROFILES; XMM-NEWTON; EMISSION LINES;

D O I：

10.1088/0004-637X/815/1/29

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

With a deep Chandra/HETGS exposure of WR 6, we have resolved emission lines whose profiles show that the X-rays originate from a uniformly expanding spherical wind of high X-ray-continuum optical depth. The presence of strong helium-like forbidden lines places the source of X-ray emission at tens to hundreds of stellar radii from the photosphere. Variability was present in X-rays and simultaneous optical photometry, but neither were correlated with the known period of the system or with each other. An enhanced abundance of sodium revealed nuclear-processed material, a quantity related to the evolutionary state of the star. The characterization of the extent and nature of the hot plasma in WR 6 will help to pave the way to a more fundamental theoretical understanding of the winds and evolution of massive stars.

引用

页数：16

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