1999MNRAS.309..561Z

Query : 1999MNRAS.309..561Z

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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Number of rows : 4

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	V* GU Mus	HXB	11 26 26.5961559600	-68 40 32.877752952					K3V-K7V	734	1
2	V* V1033 Sco	HXB	16 54 00.1423963019	-39 50 44.761701340				16.14	F3-6IV	1980	0
3	HD 226868	HXB	19 58 21.6757355952	+35 12 05.784512688	9.38	9.72	8.91	8.42	O9.7Iabpvar	4590	0
4	V* V404 Cyg	HXB	20 24 03.8247037434	+33 52 01.961154861					G9/K0III/V	1370	0

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