Optical study of GX339-4

Details Optical study of GX339-4 Optical study of GX339-4

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.363s&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

GX339-4 is the only candidate black-hole binary which shows four X-ray spectral states: hard-high, hard-low, soft-high and soft-low states. We have carried out optical spectroscopic and photometric studies of the source: we have obtained medium-resolution spectra during its hard-low state, in May 1997, and high-resolution spectra during its soft-high state, in June 1998 and August 1998. Hydrogen Balmer lines, He II lambda4686, He I lambda6678 and He I lambda7065 all show double-peaked profiles, a signature of a bright accretion disk. Peak-to-peak velocity separations are different for each line, depending on the region of the disk from where they are emitted (e.g., He II lambda4686 is emitted in a hotter region of the disk than Hα). Photometric observations show large irregular flickering in the disk brightness; we look for possible correlations with the soft X-ray flux measured by ASM.

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