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.
引用
收藏
页码:L17 / L21
页数:5
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