Spectra of accretion discs around white dwarfs
نویسندگان
چکیده
منابع مشابه
Magnetic Accretion Onto White Dwarfs
The influence of the magnetic field on process of the accretion onto White Dwarfs in Cataclysmic Variables (CVs) is discussed. Except for the Polars or AM Her objects, the strength of magnetic field can not be measured directly in CVs by modern techniques. But there is growing evidence that most of the types of Cataclysmic Variables classified on the basis of their observational characteristics...
متن کاملAccretion onto Magnetic White Dwarfs
Recent developments in the accretion onto magnetic white dwarfs are reviewed. Accreting magnetic white dwarfs display many of the characteristics of accreting systems of a galactic scale, with the advantage that in these systems the accreting material is collimated into a relatively well-determined 1-dimensional ow.
متن کاملReflection Spectra from Photoionized Accretion Discs
We review recent progress on the modeling and use of reflection spectra from irradiated and ionized accretion discs. On the computational side, calculations of reflection spectra from discs with non-uniform density structure have shown that thermal instabilities can effect the predictions. Ionized reflection spectra have been used effectively in fitting data of Narrow-Line Seyfert 1 galaxies, a...
متن کاملAccretion on to Magnetic White Dwarfs
The Magnetic Cataclysmic Variables (MCVs) are close interacting binaries where mass is transferred from a late type secondary star to a magnetic white dwarf. Two modes of accretion can be identified depending on the strength of the magnetic field, the mass transfer rate and orbital parameters. (a) Disced Accretion: In the Intermediate polars (IPs), the mass transfer stream circularises and form...
متن کاملFormation of planetary debris discs around white dwarfs II: Shrinking extremely eccentric collisionless rings
The formation channel of the tens of compact debris discs which orbit white dwarfs (WDs) at a distance of one Solar radius remains unknown. Asteroids that survive the giant branch stellar phases beyond a few au are assumed to be dynamically thrust towards the WD and tidally disrupted within its Roche radius, generating extremely eccentric (e > 0.98) rings. Here, we establish that WD radiation c...
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ژورنال
عنوان ژورنال: New Astronomy Reviews
سال: 2008
ISSN: 1387-6473
DOI: 10.1016/j.newar.2008.03.004