POLLUTION OF SINGLE WHITE DWARFS BY ACCRETION OF MANY SMALL ASTEROIDS
نویسندگان
چکیده
منابع مشابه
Pollution of Single White Dwarfs by Accretion of Many Small Asteroids
Extrapolating from the solar system’s asteroid belt, we propose that externally-contaminated white dwarfs without an infrared excess may be experiencing continuous accretion of gas-phase material that ultimately is derived from the tidal destruction of multiple small asteroids. If this scenario is correct, then observations of metal-polluted white dwarfs may lead to determining the bulk element...
متن کاملCarbon Deficiency in Externally-polluted White Dwarfs: Evidence for Accretion of Asteroids
Existing determinations show that n(C)/n(Fe) is more than a factor of 10 below solar in the atmospheres of three white dwarfs that appear to be externallypolluted. These results are not easily explained if the stars have accreted interstellar matter, and we re-interpret these measurements as evidence that these stars have accreted asteroids with a chondritic composition. Subject headings: plane...
متن کاملMagnetic 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 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 کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2008
ISSN: 0004-6256,1538-3881
DOI: 10.1088/0004-6256/135/5/1785