SIMBAD references

2001A&A...376L..17S - Astronomy and Astrophysics, volume 376L17-21 (2001/9-3)

VLT optical observations of V821 Ara(= GX 339-4) in an extended ``off'' state.

SHAHBAZ T., FENDER R. and CHARLES P.A.

Abstract (from CDS):

We report on low-resolution spectroscopy of GX 339-4 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 GX 339-4 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 GX 339-4 to be 5.6 kpc.

Abstract Copyright: ∼

Journal keyword(s): stars: individual: GX 339-4 - stars: X-rays - stars: accretion, accretion disks - black hole physics

Simbad objects: 6

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