Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..139l&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)139-(12)148
Astronomy and Astrophysics
Astronomy
2
Black Holes (Astronomy), Gamma Ray Astronomy, Novae, Pulsars, Stellar Models, Stellar Winds, X Ray Astronomy, X Ray Binaries, X Ray Spectra, Cygnus Constellation, Deposition, Fast Fourier Transformations, Gamma Ray Telescopes, Imagery, Light Curve
Scientific paper
After more than two years of operation, the imaging gamma-ray SIGMA telescope has accumulated several days of observation toward well known X-ray binaries. Four bright sources falling in this category have been detected so far: the pulsar GX 1+4 near the center of our galaxy, the stellar wind accreting system 4U 1700-377, and the black hole candidates Cygnus X-1 and GX 339-4. Moreover, SIGMA has observed three transients sources, which turned out to be also hard X-ray sources: the burster KS 1731-260, Tra X-1, and the Musca Nova. The properties of these systems in the SIGMA domain will be reviewed and a spectral distinction between black holes and neutron stars will be sketched.
Barret Dider
Bouchet Laurent
Churazov Eugene
Claret Antonio
Dennis M.
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