FUSE Spectra of the Black Hole Binary LMC X-3

Details FUSE Spectra of the Black Hole Binary LMC X-3 FUSE Spectra of the Black Hole Binary LMC X-3

2003-08-27

arxiv.org/abs/astro-ph/0308482v1

Astron.J.126:2368,2003

Astronomy and Astrophysics

Astrophysics

12 pages including 1 table, 4 diagrams To appear in AJ

Scientific paper

10.1086/378606

Far-ultraviolet spectra of LMC X-3 were taken covering photometric phases 0.47 to 0.74 in the 1.7-day orbital period of the black-hole binary (phase zero being superior conjunction of the X-ray source). The continuum is faint and flat, but appears to vary significantly during the observations. Concurrent RXTE/ASM observations show the system was in its most luminous X-ray state during the FUSE observations. The FUV spectrum contains strong terrestrial airglow emission lines, while the only stellar lines clearly present are emissions from the O VI resonance doublet. Their flux does not change significantly during the FUSE observations. These lines are modelled as two asymmetrical profiles, including the local ISM absorptions due to C II and possibly O VI. Velocity variations of O VI emission are consistent with the orbital velocity of the black hole and provide a new constraint on its mass.

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