SIMBAD references

1999MNRAS.309..561Z - Mon. Not. R. Astron. Soc., 309, 561-575 (1999/November-1)

The 1989 May outburst of the soft X-ray transient GS 2023+338 (V404 cyg).

ZYCKI P.T., DONE C. and SMITH D.A.

Abstract (from CDS):

We reanalyse archival Ginga data of the soft X-ray transient source GS 2023+338 covering the beginning of its 1989 May outburst. The source showed a number of rather unusual features: very high and apparently saturated luminosity, dramatic flux and spectral variability (often on ∼1s time-scale), and generally very hard spectrum, with no obvious soft thermal component characteristic for soft/high state.

We describe the spectrum obtained at the maximum of flux and we demonstrate that it is very different from spectra of other soft X-ray transients at similar luminosity. We confirm previous suggestions that the dramatic variability was the result of heavy and strongly variable photoelectric absorption. We also demonstrate that for a short time the spectrum of the source did look like a typical soft/high state spectrum but that this coincided with very heavy absorption.


Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - black hole physics - binaries: general - stars: individual: GS 2023+338 - X-rays: stars

Simbad objects: 4

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