Radio emission from mass-outflow stars

Details Radio emission from mass-outflow stars Radio emission from mass-outflow stars

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59..395c&link_type=abstract

Astronomy and Astrophysics, vol. 59, no. 3, Aug. 1977, p. 395-400.

Astronomy and Astrophysics

Astronomy

7

Radio Emission, Radio Stars, Stellar Mass Ejection, Stellar Models, Stellar Winds, Bremsstrahlung, Isothermal Processes, Radio Astronomy, Stellar Atmospheres, Stellar Envelopes, Temperature Profiles

Scientific paper

The problem of the radio emission from the extended envelopes surrounding early-type stars undergoing mass loss is considered. The emission is interpreted as due to thermal bremsstrahlung processes. The dynamics of the expanding atmosphere is treated in the polytropic approximation without prescribing the density and temperature profiles, as done in previous models. For a particular value of the polytropic index falling in the physically interesting range, analytical expressions are deduced for the spectral index, the radio flux, and the angular size of the emitting object, as well as a relationship between these quantities and the mass-loss rate. The model applied to P Cyg and MWC 349 gives good agreement with the existing data.

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