Constraints on the inner accretion flow of 4U /MXB 1636-53 (V 801 Arae) from a comparison of X-ray burst and persistent emission.
Abstract
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- July 1990
- Bibcode:
- 1990A&A...233..121D
- Keywords:
-
- Accretion Disks;
- Binary Stars;
- Emission Spectra;
- Stellar Spectra;
- X Ray Astronomy;
- Compton Effect;
- Electron Energy;
- Exosat Satellite;
- Neutron Stars;
- Stellar Luminosity;
- Astrophysics