Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...228..115c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 1, Feb. 1990, p. 115-124.
Astronomy and Astrophysics
Astrophysics
19
Exosat Satellite, Neutron Stars, X Ray Binaries, Absorption Spectra, Astronomical Models, Black Body Radiation, Light Curve, Stellar Atmospheres, Stellar Mass
Scientific paper
During a 17-hour continuous Exosat observation of the faint X-ray source XB 1905 + 000 a single burst was detected which shows a long decay following a radius expansion-contraction phase near maximum bolometric flux. The best spectral fits for the persistent emission are found when a 10-percent contribution from a cool blackbody component is added to a hard spectrum represented by a power law. During the burst decay the blackbody burst emission evolves clearly into the small cool component seen in the persistent emission. From the relation between the observed color temperature and the bolometric flux, an allowed region in the M-R diagram is delimited for a neutron star with a hydrogen-rich atmosphere, and a distance of 8 + or - 1 kpc is derived for the source. This yields an absolute visual magnitude of + 4.8 for the optical counterpart.
Chevalier Clément
Ilovaisky Sergio A.
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