Gamma rays from active regions in the galaxy - The possible contribution of stellar winds

Details Gamma rays from active regions in the galaxy - The possible contribution of stellar winds Gamma rays from active regions in the galaxy - The possible contribution of stellar winds

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ssrv...36..173c&link_type=abstract

(International Astronomical Union, Meeting on Galactic Astrophysics and Gamma-Ray Astronomy, Patras, Greece, Aug. 19, 1982) Spac

Astronomy and Astrophysics

Astronomy

57

Gamma Ray Astronomy, Milky Way Galaxy, Radiation Sources, Stellar Winds, Cosmic Rays, O Stars, Particle Acceleration, Stellar Mass Ejection, Supernovae, T Tauri Stars, Wolf-Rayet Stars

Scientific paper

A fraction of the mechanical energy released by stars larger than 20 solar masses in the form of strong stellar winds may be transferred to relativistic cosmic rays by diffusive shock acceleration at the wind boundary and/or in the expanding turbulent wind itself. After assessing the current knowledge of strong stellar wind energetics from O and WR stars, as well as from T Tauri stars, it is shown that stellar winds dominate the energetics of OB associations during the first 4-6 million years, after which SNs take over. A small but significant fraction of the COS-B gamma-ray sources may be fueled by WR and O stellar winds in OB associations, while the power released by T Tauri stars alone may not be sufficient to account for the gamma-ray emission of nearby dark clouds. Attention is given to the controversial aspects of the physics of particle acceleration by stellar winds.

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