Particle acceleration and nonthermal radio emission in binaries of early-type stars

Details Particle acceleration and nonthermal radio emission in binaries of early-type stars Particle acceleration and nonthermal radio emission in binaries of early-type stars

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402..271e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 1, p. 271-279.

Astronomy and Astrophysics

Astrophysics

200

Binary Stars, Early Stars, Nonthermal Radiation, Particle Acceleration, Radio Emission, Continuous Radiation, Stellar Mass Ejection, Wolf-Rayet Stars

Scientific paper

It is shown that the stellar wind collisions in early-type binaries may be strong sources of both high-energy particles and nonthermal emission. Nonthermal radio emission may be observed only if the orbital period of the binary is more than some critical value. For a typical Wolf-Rayet binary the value of the critical period is of the order of a month when the frequency of observation is a few GHz. Observations of nonthermal radio emission of the remarkable Wolf-Rayet binary WR 140, such as luminosity, spectrum, time variability in the process of orbital motion, the size of nonthermal radio source, etc., are explained by a model in which its nonthermal radio emission is generated at the site of stellar wind collision. Considerations of shock acceleration theory suggest that the WR 140 system may be a strong source of gamma-rays. It is proposed that EGRET could both measure the time dependence of the gamma-ray emission as well as resolve an inverse Compton spectrum from a pion decay spectrum and thereby provide information on the electron versus proton content of the relativistic particles.

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