Multiwavelength Observations of GX 339-4 in 1996. III. Keck Spectroscopy
arXiv:astro-ph/9812162 · doi:10.1086/307392
Abstract
As part of our multiwavelength campaign of observations of GX 339-4 in 1996 we present our Keck spectroscopy performed on May 12 UT. At this time, neither the ASM on the RXTE nor BATSE on the CGRO detected the source. The optical emission was still dominated by the accretion disk with V approximately 17 mag. The dominant emission line is H alpha, and for the first time we are able to resolve a double peaked profile. The peak separation Delta v = 370 +/- 40 km/s. Double peaked H alpha emission lines have been seen in the quiescent optical counterparts of many black hole X-ray novae. However, we find that the peak separation is significantly smaller in GX 339-4, implying that the optical emission comes from a larger radius than in the novae. The H alpha emission line may be more akin to the one in Cygnus X-1, where it is very difficult to determine if the line is intrinsically double peaked because absorption and emission lines from the companion star dominate.
Submitted to Astrophysical Journal. 10 pages. 2 figures
References in corpus (3)
Cited by in corpus (8)
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- Optical Spectral Monitoring of XTE J1118+480 in Outburst: Evidence for a Precessing Accretion Disk?
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- Multiwavelength Observations of GX 339-4 in 1996. II. Rapid X-ray Variability
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