Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..629l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 629-638. Research supported by Space Telescope Scien
Astronomy and Astrophysics
Astronomy
81
Early Stars, Hot Stars, Radio Emission, Stellar Mass Ejection, Stellar Radiation, Stellar Winds, Millimeter Waves, Radiant Flux Density, Radio Astronomy
Scientific paper
The detection of seven hot stars at a wavelength of 1.3 mm with the Swedish-ESO Submillimeter Telescope at La Silla is reported. The measured millimeter fluxes are combined with existing centimeter data to study the radio spectrum. The spectral index of about 0.6 is consistent with emission from optically thick free-free radiation in an isotropic, isothermal outflow expanding at constant velocity. Several mechanisms which can lead to spectral indices different from 0.6 are discussed. Attention is focused on the influence of acceleration and deceleration zones and on changes of the ionization structure in the wind. Such effects are likely to be present and may steepen the spectral index by about 0.1. However, the consequences for the derived mass-loss rates if these effects are not taken into account are negligible. The results suggest that radio mass-loss rates are not significantly affected by uncertainties due to extrapolation of the wind conditions from regions where spectral lines are formed to the region where the radio flux is emitted.
Leitherer Claus
Robert Carmelle
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