Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..175d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 1, Aug. 1991, p. 175-178. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
15
B Stars, Radio Observation, Radio Spectra, Stellar Envelopes, Variable Stars, Emission Spectra, Stellar Mass Ejection, Stellar Winds
Scientific paper
New multifrequency radio observations of six Be stars previously detected at 2 cm are presented. These observations were obtained to determine the outer structure of the circumstellar winds from the radio spectral indices and to search for radio variability. The radio spectral indices are all positive which provides conclusive evidence that the far-IR, millimeter and radio emission from Be stars arise from thermal radiation from ionized gas. Also, the radio spectral indices of four of the stars are in good agreement with spectral indices derived from millimeter and previous 2 cm observations, indicating that there is no significant change in the structure of the circumstellar material between the submillimeter-millimeter turnover and radio wavelengths. However, the radio spectral indices derived for beta Mon A and EW Lac, based on multiepoch data, are greater than +2.0, the maximum for thermal radio emission. This may result from an additional turnover at radio wavelengths or variability in the radio emission.
Dougherty Sean M.
Taylor Russ A.
Waters Laurens B. F. M.
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