Observations of an X-ray nova in the Musca constellation with the ART-P telescope of the GRANAT observatory - Localization and spectral variability

Details Observations of an X-ray nova in the Musca constellation with the ART-P telescope of the GRANAT observatory - Localization and spectral variability Observations of an X-ray nova in the Musca constellation with the ART-P telescope of the GRANAT observatory - Localization and spectral variability

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sval...18....5g&link_type=abstract

Soviet Astronomy Letters, Vol. 18, p. 5; Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 18, no. 1, Jan. 1992, p. 11-29

Astronomy and Astrophysics

Astronomy

19

Novae, Stellar Spectra, X Ray Sources, X Ray Spectroscopy, X Ray Stars, Light Curve, Variability, X Ray Astronomy, X Ray Telescopes

Scientific paper

Data of observations of a 1991 nova in the Musca constellation (GRS1124 - 684) with the ART-P telescope of the Granat observatory, which were obtained during the first seven months after the outburst, are presented. The X-ray nova was localized with an accuracy of better than 1 arcmin, which allowed its optical identification to be confirmed. The source spectrum was similar to X-ray spectra of the well-known black hole candidates but had a steeper (alpha = 2.4) hard tail. The soft luminosity of the source declined during the entire observational period, with an e-folding decay time of about 28 d. According to the ART-P data, the source luminosity decreased by a factor of about 20 in the 8-30 keV band and by a factor of about 120 in the 3-8 keV band during the approximately 200 d of observations. The source did not exhibit significant variability on time scales of minutes and seconds, unlike Cyg X-1 or GS2-23 + 338). In this respect Nova Muscae was similar to Nova Vulpecula (GS2000 + 25).

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