Microwave radiation from magnetic stars

Details Microwave radiation from magnetic stars Microwave radiation from magnetic stars

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.102..189z&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 102, no. 1, July 1984, p. 189-209.

Astronomy and Astrophysics

Astrophysics

4

Cyclotron Radiation, Magnetic Stars, Microwave Emission, Radio Stars, Stellar Coronas, Stellar Radiation, Peculiar Stars, Polarization Characteristics, Stellar Magnetic Fields, Stellar Models, Stellar Spectra

Scientific paper

Cyclotron microwave emission from magnetic stars is considered, assuming that they have coronae with the temperature T ⪉ 107K and the emission measure EM ⪉ 1054 cm-3. It is shown that the cyclotron radiation from a star with a dipole magnetic field has a specific spectrum with a maximum in the frequency range sν0/2 < ν < sν0/√2 (s being the number of cyclotron harmonic, and ν0 the gyrofrequency corresponding to the polar magnetic field) and radiation flux decreasing towards lower frequencies as ν4/3. The radiation is partially circularly-polarized in the sense of an extraordinary mode. The degree of polarization is almost constant at frequencies ν < sν0/2 and increases with frequency at ν > sν0/2. The estimation of cyclotron radio fluxes of the nearest magnetic stars shows that they are observable in microwaves by means of modern radio astronomy.

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