Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233..121d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 1, July 1990, p. 121-136.
Astronomy and Astrophysics
Astronomy
8
Accretion Disks, Binary Stars, Emission Spectra, Stellar Spectra, X Ray Astronomy, Compton Effect, Electron Energy, Exosat Satellite, Neutron Stars, Stellar Luminosity
Scientific paper
A detailed analysis is presented of the importance of Comptonization in burst and persistent spectra of the low-mass X-ray binary 4U/MXB 1636-53, and from this analysis it is inferred that the inner accretion flow is geometrically thin. It is found that burst spectra of 1636-53 are very nearly Planckian in shape; from an upper limit to a high-energy excess in these spectra it is inferred that the Thomson scattering optical depth of a possible intervening hot cloud must be less than 1 during bursts, and that the Compton y parameter of that cloud must be less than 0.5. During persistent emission, Thomson optical depth of 4-8, an electron temperature of 2-5 keV, and a value of 0.8-1.1 for y are inferred.
Damen Eugene
Jansen Fabian
Lewin Walter H. G.
Oosterbroek Tim
Paradijs Jan van
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