X-ray emission from cataclysmic variables with accretion disks. II. EUV/Soft x-ray radiation
About half of the gravitational luminosity released by gas accreting onto a white dwarf through a disk should emerge from the star/disk boundary layer. For the accretion rates present in many cataclysmic variables, theory predicts that this luminosity should be in the form of an optically thick EUV/soft X-ray component, with T/sub e/roughly-equal(1-3) x 10/sup 5/ K. We compare the theoretical predictions with presently available soft X-ray observations and find satisfactory agreement. Previous doubts on this point were based on inappropriate choices for several critical parameters: white dwarf mass, interstellar column density, and the space density of classical novae. We also attempt to constrain the boundary layer radiation by comparing observed and predicted strengths of the He II lambda1640 and lambda4686 emission lines, assuming that these are produced by photoionization in the upper layers of the disk. The results support the simple optically thick model for high-M systems, but may require complicated X-ray spectra in low-M systems.
- Research Organization:
- Department of Astronomy, Columbia University
- OSTI ID:
- 5146510
- Journal Information:
- Astrophys. J.; (United States), Vol. 292:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
The EUV emission of cataclysmic variables
DETECTION OF ACCRETION X-RAYS FROM QS Vir: CATACLYSMIC OR A LOT OF HOT AIR?
Related Subjects
GENERAL PHYSICS
VARIABLE STARS
BINARY STARS
EXTREME ULTRAVIOLET RADIATION
SOFT X RADIATION
STAR ACCRETION
STAR MODELS
BOUNDARY LAYERS
EMISSION SPECTRA
GRAVITATIONAL RADIATION
LUMINOSITY
NOVAE
PHOTOIONIZATION
RADIATION FLUX
WHITE DWARF STARS
DWARF STARS
ELECTROMAGNETIC RADIATION
ERUPTIVE VARIABLE STARS
IONIZATION
IONIZING RADIATIONS
LAYERS
MATHEMATICAL MODELS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SPECTRA
STAR EVOLUTION
STARS
ULTRAVIOLET RADIATION
X RADIATION
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources