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

Bibcode
2001A&A...376L..17S
DOI
10.1051/0004-6361:20011042
Shahbaz, T.; Fender, R.; Charles, P. A.
Bibliographical reference

Astronomy and Astrophysics, v.376, p.L17-L21 (2001)

Advertised on:
9
2001
Journal
Astronomy and Astrophysics
Number of authors
3
IAC number of authors
1
Citations
51
Refereed citations
45
Description
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. Based on observations performed at the European Southern Observatory, Paranal, Chile.
Type
Refereed

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