XMM-NEWTON OBSERVATIONS REVEAL VERY HIGH X-RAY LUMINOSITY FROM THE CARBON-RICH WOLF-RAYET STAR WR 48a

被引：19
作者：
Zhekov, Svetozar A. [1 ]
Gagne, Marc [2 ]
Skinner, Stephen L. [3 ]
机构：
[1] Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA
[2] W Chester Univ, Dept Geol & Astron, W Chester, PA 19383 USA
[3] Univ Colorado, CASA, Boulder, CO 80309 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 727卷 / 01期
关键词：
shock waves; stars: individual (WR 48a); stars: Wolf-Rayet; X-rays: stars; TERMINAL VELOCITIES; HETG OBSERVATIONS; STELLAR WIND; CHANDRA; EMISSION; BINARY; SPECTROSCOPY; L=305-DEGREES; ABSORPTION; SHOCKS;
D O I：
10.1088/2041-8205/727/1/L17
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present XMM-Newton observations of the dusty Wolf-Rayet (W-R) star WR 48a. This is the first detection of this object in X-rays. The XMM-Newton EPIC spectra are heavily absorbed and the presence of numerous strong emission lines indicates a thermal origin of the WR 48a X-ray emission, with dominant temperature components at kT(cool) approximate to 1 keV and kT(hot) approximate to 3 keV, the hotter component dominating the observed flux. No significant X-ray variability was detected on timescales <= 1 day. Although the distance to WR 48a is uncertain, if it is physically associated with the open clusters Danks 1 and 2 at d similar to 4 kpc, then the resultant X-ray luminosity L-X similar to 10(35) erg s(-1) makes it the most X-ray luminous W-R star in the Galaxy detected so far, after the black hole candidate Cyg X-3. We assume the following scenarios as the most likely explanation for the X-ray properties of WR 48a: (1) colliding stellar winds in a wide WR+O binary system, or in a hierarchical triple system with non-degenerate stellar components and (2) accretion shocks from the WR 48a wind onto a close companion (possibly a neutron star). More specific information about WR 48a and its wind properties will be needed to distinguish between the above possibilities.
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