A discussion of the infrared and radio region of the calculated spectral energy distribution of O-type stars

Details A discussion of the infrared and radio region of the calculated spectral energy distribution of O-type stars A discussion of the infrared and radio region of the calculated spectral energy distribution of O-type stars

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...120...89g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 120, no. 1, April 1983, p. 89-96.

Astronomy and Astrophysics

Astrophysics

11

Infrared Stars, O Stars, Spectral Energy Distribution, Stellar Mass Ejection, Stellar Radiation, Stellar Spectra, Flow Velocity, Infrared Spectra, Interstellar Extinction, Radiant Flux Density, Radio Spectra, Stellar Coronas, Stellar Envelopes, Stellar Temperature

Scientific paper

The results of numerical calculations of the emerging radiation of O-type stars having an accelerated mass outflow are presented. This radiation consists of the free-free emission from the extended gaseous envelope, superposed on the attenuated flux of the star. The spectral energy distributions calculated with various physical parameters, show that the influence of free-free emission can be expected only after ≡5 μm. Furthermore, the effect of a stellar corona, if any, shows up also at wavelengths longer than 5 μm. Free-free emission influences the spectral energy distribution at λ < 5 μm only, when in the stellar envelope extreme physical conditions prevail. It is argued that the discrepancies found by various authors for the mass loss rate of O-type stars determined using observed infrared and radio fluxes are caused by an inadequate treatment of the measured infrared fluxes.

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