Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..236c&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, Apr. 1, 1980, p. 236-243.
Astronomy and Astrophysics
Astronomy
82
Cosmic Rays, Gamma Ray Astronomy, Particle Acceleration, Stellar Winds, Supersonic Speed, B Stars, Cos-B Satellite, Energy Spectra, Herbig-Haro Objects, Milky Way Galaxy, O Stars, Solar Wind, Stellar Evolution, Stellar Luminosity, Stellar Models, Supergiant Stars, T Tauri Stars
Scientific paper
Supersonic stellar winds are quite common among the brightest and/or the youngest stars, i.e., O stars and B supergiants, T Tauri stars, Herbig-Haro objects etc. It is proposed that the shocked region at the boundary between the stellar wind and the surrounding medium is, under certain conditions, the site of acceleration of charged particles with a power-law energy spectrum, extending a suggestion proposed by Jokipii for the solar wind. This mechanism should operate up to 10 to the 15th eV. On the basis of the Copernicus UV observations, it is suggested that the luminous OB stars pertaining to the Gould Belt are the major sources of local cosmic rays. Observational support to cosmic-ray acceleration by stellar winds in the Rho Oph cloud, based on high-energy gamma-ray observations performed by the COS B satellite are presented. A major consequence of these views is the peculiar character of our local galactic environment as far as cosmic rays are concerned.
Cass'e Michel
Paul J. A.
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