Radio observations of early-type emission-line stars and related objects

Details Radio observations of early-type emission-line stars and related objects Radio observations of early-type emission-line stars and related objects

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..321p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 198, Jan. 1982, p. 321-338. Research supported by York University.

Astronomy and Astrophysics

Astronomy

80

Early Stars, Emission Spectra, Line Spectra, Radio Spectra, Radio Stars, Stellar Evolution, Angular Resolution, Density Distribution, Northern Hemisphere, Radio Emission, Southern Hemisphere, Stellar Atmospheres, Stellar Envelopes, Stellar Mass Ejection, Stellar Temperature, Thermal Emission

Scientific paper

A description is presented of radio observations of 325 objects. Most of the objects are optically unresolved, but a small number have appreciable angular extent. It can be shown that even if the objects are optically unresolved the thermally-emitting gas must be orders of magnitude larger than the associated stars, and they could be referred to as small nebulae. However, that terminology would tend to disguise the intimate connection between the radio-emitting gas and the star, which in all likelihood expelled the gas from its atmosphere some time in the recent past. It is, therefore, preferred to refer to the nebulae as circumstellar shells. The continuum radio spectrum has been determined for several of the thermally-emitting radio stars, and in most cases the spectrum is found to be flat. This is usually interpreted as bremsstrahlung radiation from optically-thin gas.

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