DISCOVERY AND INTERPRETATION OF AN X-RAY PERIOD IN THE GALACTIC CENTER SOURCE CXOGC J174536.1-285638

被引：4

作者：

Mikles, Valerie J. ^{[1
]}

Eikenberry, Stephen S. ^{[1
]}

Bandyopadhyay, Reba M. ^{[1
]}

Muno, Michael P. ^{[2
]}

机构：

[1] Univ Florida, Dept Astron, Gainesville, FL 32611 USA

[2] CALTECH, Space Radiat Lab, Pasadena, CA 91125 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 689卷 / 02期

基金：

美国国家科学基金会;

关键词：

accretion; accretion disks; infrared: stars; stars: individual (CXOGC J174536.1-2856); X-rays: binaries; X-rays: stars;

D O I：

10.1086/592593

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present X-ray and infrared observations of the X-ray source CXOGC J174536.1-285638. Previous observations suggest that this source may be an accreting binary with a high-mass donor (HMXB) or a colliding wind binary (CWB). Based on the Chandra and XMM-Newton light curve, we have found an apparent 189 +/- 6 day periodicity with better than 99.997% confidence. We discuss several possible causes of this periodicity, including both orbital and superorbital interpretations. We explore in detail the possibility that the X-ray modulation is related to an orbital period and discuss the implications for two scenarios; one in which the variability is caused by obscuration of the X-ray source by a stellar wind, and the other in which it is caused by an eclipse of the X-ray source. We find that in the first case, CXOGC J174536.1-285638 is consistent with both CWB and HMXB interpretations, but in the second, CXOGC J174536.1-285638 is more likely a HMXB.

引用

页码：1222 / 1233

页数：12

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