Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...106..266p&link_type=abstract
Astronomy and Astrophysics, vol. 106, no. 2, Feb. 1982, p. 266-273.
Astronomy and Astrophysics
Astrophysics
44
B Stars, Early Stars, O Stars, Particle Acceleration, Stellar Winds, Terminal Velocity, Light Scattering, Radiative Transfer, Ultraviolet Absorption
Scientific paper
The processes of radiative acceleration of stellar winds on OB stars by single and multiple photon scattering are discussed. Single scattering can be the main accelerating process for stars later than B2 and can account for terminal velocities up to 500-1000 km/s. Multiple scattering of photons in the approximate range 200-500 A furnishes additional wind acceleration for stars earlier than B2 to reach terminal velocities of up to 2000-4000 km/s. A systematic increase is predicted of the terminal velocity as a function of the effective temperature. Observational data give a good confirmation of this expectation. Both theory and observation show that the terminal velocity is about three times the escape velocity for O-type stars; for later types, however, the velocities tend to become equal.
Macchetto Ferdinando
Panagia Nino
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