Collisionless perpendicular shocks - Applications to solar type II radio bursts and the Antares /alpha Sco/ radio emission

Details Collisionless perpendicular shocks - Applications to solar type II radio bursts and the Antares /alpha Sco/ radio emission Collisionless perpendicular shocks - Applications to solar type II radio bursts and the Antares /alpha Sco/ radio emission

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100..291k&link_type=abstract

Astronomy and Astrophysics, vol. 100, no. 2, July 1981, p. 291-301.

Astronomy and Astrophysics

Astrophysics

8

B Stars, Ion Acoustic Waves, Radio Emission, Radio Stars, Shock Wave Propagation, Type 2 Bursts, Bow Waves, Brightness Temperature, Companion Stars, Fine Structure, Stellar Mass Ejection, Stellar Winds

Scientific paper

A model of a collisionless perpendicular shock is proposed based on (1) local marginal stability of ion-acoustic waves and (2) ion heating in supercritical shocks by a beam of reflected ions behind the shock proper. The mean turbulence energy density in the shock is calculated. Type II radio bursts of the sun and their characteristic fine structures lend themselves to explanation. The effective temperature of the ion-sound waves is found to be substantially larger than the observed radio brightness temperature. By using the turbulent Bremsstrahlung mechanism for Langmuir waves, the radio luminosity can be accounted for. In addition, the observed radio emission from the Antares B companion star embedded in a stellar wind from the M supergiant is considered. The available free energy in a single bow shock is found to be far less than the observed radio luminosity. The estimated wind from the B star itself, however, creates a secondary shock which is sufficiently energetic to account for the observed emission.

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