Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.131..657c&link_type=abstract
(IAU, Colloquium on Cataclysmic Variables. Recent Multi-Frequency Observations and Theoretical Developments, 93rd, Bamberg, West
Astronomy and Astrophysics
Astrophysics
6
Binary Stars, Cataclysmic Variables, Circular Polarization, Infrared Spectra, Optical Polarization, Stellar Models, Emission Spectra, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Temperature, White Dwarf Stars
Scientific paper
Multiband observations of the AM Herculis-type binary CW 1103+254 show significant circular polarization (≡13%) in the J band. Recently, a model with high temperature (kT ≡ 20 keV) and small dimensionless plasma parameter (Λ ≡ 104) was suggested for the emitting region. However, it gives negligible polarization in the J band. In this paper, a method, in which the J band polarization and the peak frequency ν* of the spectrum are taken into account, is used to determine T and Λ. The temperature of the emitting region is close to the value (kT = 8.7 keV) derived for the region emitting cyclotron lines in VV Puppis. If these radiations arise from the post-shock regions, then these temperatures are significantly lower than those predicted by standard accretion models or the shock structure is inhomogeneous and more complex than previously assumed.
Chanmugam G.
Wu Ke
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