X-ray spectroscopy of cataclysmic variables
نویسندگان
چکیده
منابع مشابه
X-ray Spectroscopy of Cataclysmic Variables
In cataclysmic variables (CVs), accretion onto white dwarfs produces high temperature, high density plasmas. They cool down from kT∼10 keV via bremsstrahlung continuum and K and L shell line emissions. The small volume around white dwarfs means that the plasma densities are much higher than in, e.g., stellar coronae, probably beyond the range well-described by existing models. I will describe p...
متن کاملX-ray and Euv Spectroscopy of the Boundary Layer Emission of Nonmagnetic Cataclysmic Variables
EUVE , ROSAT , and ASCA observations of the boundary layer emission of nonmagnetic cataclysmic variables (CVs) are reviewed. EUVE spectra reveal that the effective temperature of the soft component of high-Ṁ nonmagnetic CVs is kT ∼ 10–20 eV and that its luminosity is∼ 0.1–0.5 times the accretion disk luminosity. Although the EUV spectra are very complex and belie simple interpretation, the phys...
متن کاملTwo Types of X-ray Spectra in Cataclysmic Variables
We present Chandra HETG spectra of seven cataclysmic variables. We find that they divide unambiguously into two distinct types. Spectra of the first type are remarkably well fit by a simple cooling flow model, which assumes only steady-state isobaric radiative cooling. The maximum temperature, kTmax, and the normalization, which provides a highly precise measurement of the accretion rate, are t...
متن کاملThe EUV and X-ray Emission of Nonmagnetic Cataclysmic Variables
Recent results are presented and discussed regarding the EUV and X-ray emission of nonmagnetic cataclysmic variables. Emphasis is given to high accretion rate systems (novalike variables and dwarf novae in outburst), and to a number of apparent discrepancies between observations and the theory of the boundary layer between the accretion disk and the surface of the white dwarf. Discussed are EUV...
متن کاملRecent Advances in X-ray Observations of Cataclysmic Variables
A personal selection of noteworthy X-ray results on CVs are presented, with emphasis on XMM-Newton and Chandra observations. Progressing roughly from broad-band view to narrow-band, high spectral resolution studies, I summarize: the energy balance of polars; X-ray confirmation of IPs; eclipses in non-magnetic CVs; search for magnetism in " non-magnetic " CVs; multi-temperature plasma emission f...
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ژورنال
عنوان ژورنال: Advances in Space Research
سال: 2003
ISSN: 0273-1177
DOI: 10.1016/s0273-1177(03)90646-6