Observations of a nova in the Musca constellation with the Sigma telescope of the GRANAT Observatory - Hard X-ray spectral properties and the discovery of an annihilation line in the spectrum

Details Observations of a nova in the Musca constellation with the Sigma telescope of the GRANAT Observatory - Hard X-ray spectral properties and the discovery of an annihilation line in the spectrum Observations of a nova in the Musca constellation with the Sigma telescope of the GRANAT Observatory - Hard X-ray spectral properties and the discovery of an annihilation line in the spectrum

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pazh...17.1059g&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 17, Dec. 1991, p. 1059-1081. In Russian. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

5

Annihilation Reactions, Astronomical Observatories, Emission Spectra, Novae, X Ray Spectra, X Ray Stars, Light Curve, Stellar Luminosity, Stellar Spectra, Stellar Spectrophotometry, Telescopes

Scientific paper

Spectral data in the 3-1300-keV band provided by observations of a recently discovered X-ray nova in Musca are presented. The source spectrum exhibits two distinct components: a soft, below-8-keV component, and a hard, nearly-power-law component detected up to energies of 200-300 keV. The soft emission changed gradually with a characteristic decay time of about 30 d, while the power-law component exhibited strong variability on time scales of several hours and decreased much more slowly. During observations of the Musca Nova over a period of 200 d after the outburst, the hard X-ray flux from the source declined by a factor of 6-10, while in standard X-rays, the source declined by a factor of 30-40 for the same period.

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