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https://hdl.handle.net/11147/1988
Title: | Cyclotron Emission From Accretion Plasma Columns in Magnetic Cataclysmic Variable Stars | Authors: | Kalomeni, Belinda Pekünlü, Esat Rennan Yakut, Kadri |
Keywords: | Astronomy Cyclotrons Magnetic fields Plasmas White dwarfs Galaxies |
Publisher: | EDP Sciences | Source: | Kalomeni, B., Pekünlü, E.R., and Yakut, K. (2005). Cyclotron emission from accretion plasma columns in magnetic cataclysmic variable stars. Astronomy and Astrophysics, 439(3), 823-833. doi:10.1051/0004-6361:20041780 | Abstract: | Pure cyclotron spectra of polars produced during their low accretion states are deduced. We used the working hypothesis that the cyclotron emission is produced by electrons spiraling down the dipole magnetic field lines and forming an accretion plasma column on top of the magnetic pole of a white dwarf. The velocity distribution function of electrons emitting cyclotron radiation is assumed to be a bi-Maxwellian. Since the radiating electrons in a million-Gauss magnetic field seek their respective magnetic mirrors, the perpendicular components of their velocity vectors are assumed to be greater than the parallel ones in the radiation region. This assumption implies that the cyclotron radiation is emitted more or less in the perpendicular direction (to the local magnetic field). Then we investigated the contribution of the ordinary and the extraordinary wave modes to the luminosity. The model predictions seem to be consistent with observations. We present the model cyclotron spectra of a randomly chosen polar, UZ For, as a case study. | URI: | http://doi.org/10.1051/0004-6361:20041780 http://hdl.handle.net/11147/1988 |
ISSN: | 0004-6361 0004-6361 1432-0746 |
Appears in Collections: | Physics / Fizik Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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