Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pazh...16..403s&link_type=abstract
Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 16, May 1990, p. 403-415. In Russian. In Russian. In Russian.
Astronomy and Astrophysics
Astronomy
2
Abundance, Brightness Distribution, Supernova 1987A, X Ray Spectra, Annual Variations, Cobalt Isotopes, Light Curve, X Ray Astronomy
Scientific paper
Observations performed with the Hexe instrument onboard the Kvant module indicate that, by May-June 1989, the hard X-ray flux from SN1987 had declined by more than a factor of 8 compared with the maximum of the X-ray light curve. The upper limits to the Co-57/Co-56 abundance ratio at the level of three standard deviations was obtained. The value of this ratio exceeds that of the Fe-57/Fe-56 ratio on earth by a factor of 1.5.
Doebereiner S.
Efremov Valeri
Englhauser Jakob
Grebenev Sergei A.
Kaniovsky Alexander S.
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