Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..573d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 10, 1990, p. 573-581.
Astronomy and Astrophysics
Astrophysics
14
Early Stars, H Alpha Line, O Stars, Stellar Luminosity, Stellar Mass Ejection, Stellar Winds, Dynamic Characteristics, H I Regions, Hot Stars, Stellar Spectra
Scientific paper
Luminosities of O star winds in H I H-alpha have been calculated from a series of wind ionization models based on the dynamical structure predicted by time-independent radiation-driven wind theory. The models span the entire range in effective temperature and luminosity falling within the O spectral class. A number of different velocity laws are considered. Mass-loss rates obtained from observed values of L(H-alpha) using new fits are compared with mass-loss rates for the same stars derived from radio flux measurements. The former are found to be, on average, about 2 times larger than the latter when the theoretically preferred beta = 0.7 velocity law is assumed. Better agreement is achieved when a much more slowly accelerating beta = 1.5 velocity law is used instead.
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