Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...202..117b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 202, no. 1-2, Aug. 1988, p. 117-123. Research supported by the Royal Society,
Astronomy and Astrophysics
Astrophysics
37
Exosat Satellite, Gamma Ray Bursts, Neutron Stars, Stellar Models, Accretion Disks, Black Body Radiation, Stellar Mass Accretion, Surface Temperature
Scientific paper
Two EXOSAT observations of gamma-ray burst error boxes and their possibly associated optical transients are discussed. No point source was detected in either box. A comparison with Einstein data (Pizzichini et al., 1986) is made for one of them (November 19, 1978). The data are interpreted in the framework of neutron star models for gamma-ray bursters. Upper limits are derived for neutron star surface temperatures, accretion rates and surface densities of accretion disks. The lack of detectable X-ray emission imposes stringent constraints on accretion rates onto neutron stars, and there is a problem of consistency between EXOSAT and Einstein observations, if the data are interpreted in the framework of dense disk models.
Atteia Jean-Luc
Barat Claude
Boer Michel
Branduardi-Raymont Graziella
Cordova France
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