A radio survey of IRAS-selected Be stars

Details A radio survey of IRAS-selected Be stars A radio survey of IRAS-selected Be stars

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..453t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. 453-458. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

29

B Stars, Radio Astronomy, Sky Surveys (Astronomy), Stellar Spectra, Emission Spectra, H Alpha Line, Infrared Sources (Astronomy), Stellar Envelopes, Stellar Luminosity, Very Large Array (Vla)

Scientific paper

Results are presented of an extensive radio survey of 21 Be stars, observed with VLA on December 4, 1987, July 2, 1988, and September 28, 1988, that have strong emission in the 12-60-micron IRAS photometric bands. For most of the stars, simultaneous observations of the H-alpha line were also obtained to estimate the level of emission from circumstellar gas. A clear correlation was found between the radio data and H-alpha luminosity, indicating that the same process is responsible for both the radio and the hydrogen line emissions. In all cases, there was a turn down in the continuum spectrum of the emission excess between the FIR and the radio data, suggesting a change in the structure of the circumstellar disk outside the FIR region. It is suggested that, in at least some cases, the circumstellar disks of Be stars extend to very large distances from the star.

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