Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...87..217s&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 87, no. 1, p. 217-265.
Astronomy and Astrophysics
Astronomy
145
A Stars, B Stars, Radio Emission, Sky Surveys (Astronomy), Circular Polarization, H Alpha Line, H Ii Regions, Stellar Mass Ejection, Stellar Models, Stellar Temperature, Very Large Array (Vla)
Scientific paper
Results of a high-sensitivity VLA/Australia Telescope survey of radio continuum emission from the 57 Herbig Ae/Be stars and candidates in the 1984 catalog of Finkenzeller and Mundt are presented. Twelve stars were detected at the primary observing wavelength of 3.6 cm, on the basis that not less than 4 sigma radio sources lie within 1 arcsec of the optical positions. It is suggested that the radio emission is predominantly thermal and in many cases wind-related. The unusual eclipsing binary TY CrA is an exception and is classified as a nonthermal radio source on the basis of its decidedly negative spectral index (alpha = -1.2). A simple spherically symmetric free-fall accretion model is used to show that the predicted radio fluxes due to accretion at rates, estimated in the literature, of about 10 exp -6 to 10 exp -5 solar mass/yr are one to four orders of magnitude larger than observed.
Brown Alexander
Skinner Stephen Lee
Stewart Ron T.
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