THE OPTICAL EMISSION LINES AS A PROBE OF STATE TRANSITIONS IN BLACK-HOLE CANDIDATES [chapter]

R. SORIA
2002 The Ninth Marcel Grossmann Meeting  
Optical spectroscopic studies of emission lines in black-hole candidates can help us investigate state transitions in those systems. Changes in the optical line profiles reflect changes in the geometry of the accretion flow, usually associated with X-ray state transitions in the inner region. We identify at least four optical states in the black-hole candidate GRO J1655-40 in outburst, and two optical states in GX339-4.
doi:10.1142/9789812777386_0547 fatcat:jnccjkssnbfcdlu6g6yjurzsoe