Models of optical and soft x-ray spectra in AM Her stars
Conference
·
OSTI ID:6463559
The AM Her systems are widely believed to be cataclysmic variable systems in which the white dwarf has a magnetic field strong enough to lock the white dwarf to the companion star. The magnetic field channels the accretion flow to the magnetic polar caps of the white dwarf where the gas passes through a strong shock and the accretion energy is released. The continuum spectra of the AM Her systems have three major components: the ir/optical component, the EUV/soft x-ray component, and the hard x-ray component. Models of the AM Her systems generally agree that the hard x-rays are free-free radiation emitted by the hot postshock gas and that the optical component is electron cyclotron emission from the postshock gas. The soft x-ray component is less well understood, primarily because it is very soft (temperature less than 100 eV) and thus is very difficult to measure accurately with current instruments. Models agree that some soft x-ray emission will arise from hard x-rays and cyclotron radiation that is absorbed at the stellar surface and re-radiated, but other sources of soft x-rays have also been suggested. Thus it is important to develop models for the soft x-ray spectrum. This paper presents some preliminary results on the emission in all spectral bands based on numerical models of the accretion flow. 4 figs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6463559
- Report Number(s):
- UCRL-96673; CONF-8705155-1; ON: DE87011346
- Country of Publication:
- United States
- Language:
- English
Similar Records
Optical pulsations in AM Her systems. Revision 1
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Coordinated X-ray, ultraviolet and optical observations of AM Herculis, U Geminorum, and SS Cygni
Conference
·
Sat Jun 01 00:00:00 EDT 1985
·
OSTI ID:5374385
White dwarfs and variable degenerate stars. Proceedings of the Colloquium, July 30-August 2, 1979 and Proceedings of the Fourth Annual Workshop on Novae, Dwarf Novae and Other Cataclysmic Variables, University of Rochester, Rochester, N. Y. , August 3, 1979
Conference
·
Sun Dec 31 23:00:00 EST 1978
·
OSTI ID:6849486
Coordinated X-ray, ultraviolet and optical observations of AM Herculis, U Geminorum, and SS Cygni
Journal Article
·
Sat Jan 31 23:00:00 EST 1981
· Astrophys. J.; (United States)
·
OSTI ID:6335639
Related Subjects
640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BINARY STARS
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
DATA
DETECTION
DWARF STARS
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
INFORMATION
IONIZING RADIATIONS
NUMERICAL DATA
RADIATION DETECTION
RADIATIONS
SOFT X RADIATION
STAR ACCRETION
STAR EVOLUTION
STARS
X RADIATION
X-RAY DETECTION
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BINARY STARS
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
DATA
DETECTION
DWARF STARS
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
INFORMATION
IONIZING RADIATIONS
NUMERICAL DATA
RADIATION DETECTION
RADIATIONS
SOFT X RADIATION
STAR ACCRETION
STAR EVOLUTION
STARS
X RADIATION
X-RAY DETECTION