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- W3099183732 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 All-Sky Monitor (ASM) on the Rossi X-Ray Timing Explorer (RXTE) nor the Burst and Transient Source Experiment (BATSE) on the Compton Gamma-Ray Observatory (CGRO) detected the source. The optical emission was still dominated by the accretion disk, with V ≈ 17 mag. The dominant emission line is Hα, and for the first time we are able to resolve a double-peaked profile. The peak separation Δv = 370 ± 40 km s-1. Double-peaked Hα 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 Hα emission line may be more akin to the one in Cyg X-1, where it is very difficult to determine whether the line is intrinsically double peaked, because absorption and emission lines from the companion star dominate." @default.
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- W3099183732 date "1999-07-10" @default.
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- W3099183732 title "Multiwavelength Observations of GX 339−4 in 1996. III. Keck Spectroscopy" @default.
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- W3099183732 doi "https://doi.org/10.1086/307392" @default.
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