VLT optical observations of V821 Ara(=GX339-4) in an extended "off" state

被引：47

作者：

Shahbaz, T ^{[1
]}

Fender, R

Charles, PA

机构：

[1] Inst Astrofis Canarias, Tenerife 38200, Spain

[2] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands

[3] Ctr High Energy Astrophys, NL-1098 SJ Amsterdam, Netherlands

[4] Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England

来源：

ASTRONOMY & ASTROPHYSICS | 2001年 / 376卷 / 02期

关键词：

stars : individual : GX339-4 stars X-rays : stars accretion; accretion disks black hole physics;

D O I：

10.1051/0004-6361:20011042

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on low-resolution spectroscopy of GX339-4 during its current, extended X-ray "off" state in May 2000 (r = 20.1) obtained with the VLT Focal Reducer/low dispersion Spectrograph (FORS1). Although we do not positively detect the secondary star in GX339-4 we place an upper limit of 30 percent on the contribution of a "normal" K-type secondary star spectrum to the observed flux. Using this limit for the observed magnitude of the secondary star, we find a lower limit for the distance of GX339-4 to be 5.6 kpc.

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页码：L17 / L21

页数：5

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