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Query: journal id: "astronomyxandxastrophysics"

AuthorsE. Damen, R.A.M.J. Wijers, J. van Paradijs, W. Penninx, T. Oosterbroek, W.H.G. Lewin, F. Jansen
TitleConstraints on the inner accretion flow of 4U/MXB 1636-53 (V 801 Arae) from a comparison of X-ray burst and persistent emission
JournalAstronomy and Astrophysics
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
KeywordsAccretion disks; Binary stars; Emission spectra; Stellar spectra; X-ray astronomy
AbstractA 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.
Document typeArticle
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