Volume 376, Number 2, September II 2001
|Page(s)||L17 - L21|
|Published online||15 September 2001|
VLT optical observations of V821 Ara(=GX339-4) in an extended "off" state*
Instituto de Astrofísica de Canarias 38200 La Laguna, Tenerife, Spain
2 Astronomical Institute "Anton Pannekoek" , University of Amsterdam and Center for High Energy Astrophysics, Kruislaan, 403, 1098 SJ, Amsterdam, The Netherlands e-mail: rpf@@astro.uva.nl
3 Department of Physics & Astronomy, University of Southampton, Southampton, SO17 1BJ, UK e-mail: firstname.lastname@example.org
Corresponding author: T. Shahbaz, email@example.com
Accepted: 19 July 2001
We report on low-resolution spectroscopy of GX339-4 during its current, extended X-ray "off" state in May 2000 () 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.
Key words: stars: individual: GX339-4 / X-rays: stars / accretion, accretion disks / black hole physics
© ESO, 2001
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