Observations of radio stars at 3.3 MM

Details Observations of radio stars at 3.3 MM Observations of radio stars at 3.3 MM

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.180..297s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 180, Aug. 1977, p. 297-303.

Astronomy and Astrophysics

Astronomy

50

Millimeter Waves, Radio Stars, Stellar Radiation, Stellar Spectra, Early Stars, Optical Thickness, Radio Astronomy, Radio Spectra, Spectrum Analysis, Stellar Mass Ejection, Thermal Emission

Scientific paper

Results are reported for measurements of the 3.3-mm radio continuum flux from six early-type emission-line stars (ETELS) and the infrared objects IRC +10216 and CRL 2591. It is found that three ETELS (T Tau, P Cyg, and V1016 Cyg), and possibly Alpha Ori, have constant spectral indices up to 90 GHz, but the best least-squares-fit spectral index for each star is significantly steeper than that expected for the special case of uniform mass outflow. The remaining ETELS, Lk H-alpha 101 and MWC 349, are shown to have radio spectra that flatten between 10 and 90 GHz, which is taken as a qualitative confirmation of free-free emission theory. Mass-loss rates are estimated for each ETELS observed, the radio spectrum of IRC +10216 is fitted almost exactly to a model of emission from optically thin dust at about 400 K, and the spectrum of CRL 2591 is attributed to a combination of optically thin free-free emission and thermal dust emission.

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