Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.232..647s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 232, June 1, 1988, p. 647-660. Research supported by th
Astronomy and Astrophysics
Astronomy
60
Accretion Disks, Stellar Mass, Variable Stars, X Ray Binaries, X Ray Sources, Exosat Satellite, Line Of Sight, Thomson Scattering
Scientific paper
Three EXOSAT observations of the low-mass X-ray binary XB 1916-053 have revealed extreme variability in the appearance of the dips, ranging from complete absence to two broad, deep dips per 50-min cycle. These dips are believed to result from the obscuration of the central X-ray source by azimuthal structure in the accretion disc. The X-ray spectrum during quiescent (i.e. non-dipping, non-bursting) intervals is well described by a simple power-law model with photon index -1.8. Intensity-selected spectra are well fitted by either a simple power law which becomes flatter with decreasing flux, or a composite model with contributions from a heavily-absorbed component and a non-absorbed, probably Thomson scattered component. From an analysis of four bursts observed from XB 1916-053, and the assumption that the peak luminosity in the bursts can be equated with the Eddington luminosity, the authors derive a distance of 8.4 kpc to the source assuming cosmic abundances, or 10.8 kpc if the accreted material is extremely hydrogen-deficient, as required by published evolutionary models.
Gottwald Manfred
Mason Keith O.
Smale Alan P.
White Nick E.
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