Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-07-24
Astronomy and Astrophysics
Astrophysics
5 pages, 5 figures, AA letters
Scientific paper
10.1051/0004-6361:20011042
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.
Charles Phil A.
Fender Rob
Shahbaz Tariq
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