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2004MNRAS.354...31S - Mon. Not. R. Astron. Soc., 354, 31-42 (2004/October-2)
Optical spectroscopy of flares from the black hole X-ray transient A0620-00 in quiescence.
SHAHBAZ T., HYNES R.I., CHARLES P.A., ZURITA C., CASARES J., HASWELL C.A., ARAUJO-BETANCOR S. and POWELL C.
Abstract (from CDS):
By isolating the spectrum of the flare we find that it has a frequency power-law index of -1.40±0.20 (90 per cent confidence). The flare spectrum can also be described by an optically thin gas with a temperature in the range 10000-14000 K that covers 0.05-0.08 per cent (90 per cent confidence) of the surface of the accretion disc. Given these parameters, the possibility that the flares arise from the bright-spot cannot be ruled out.
We construct Doppler images of the Hα and Hβ emission lines. Apart from showing enhanced blurred emission at the region where the stream impacts the accretion disc, the maps also show significant extended structure from the opposite side of the disc. The trailed spectra show characteristic S-wave features that can be interpreted in the context of an eccentric accretion disc.
Abstract Copyright: 2004 RAS
Journal keyword(s): accretion, accretion discs - binaries: close - stars: individual: A0620-00
CDS comments: A0620-00 is 1A 0620-00.
Simbad objects: 9
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