C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET19:07:43

2005A&A...439..823K - Astronomy and Astrophysics, volume 439, 823-833 (2005/9-1)

Cyclotron emission from accretion plasma columns in magnetic cataclysmic variable stars.


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): magnetic fields - plasmas - stars: white dwarfs - stars: magnetic fields

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 V* UZ For AM* 03 35 28.6515678221 -25 44 21.765602833           M4.5 248 0
2 V* VV Pup AM* 08 15 06.8010742098 -19 03 17.765651066     13.90     M7V 385 0

    Equat.    Gal    SGal    Ecl

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