Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...159l...1w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 159, no. 1-2, April 1986, p. L1-L4. ZWO-supported research.
Astronomy and Astrophysics
Astronomy
20
B Stars, Dwarf Stars, Infrared Spectra, Stellar Color, Stellar Rotation, Stellar Spectrophotometry, Infrared Astronomy Satellite, Spaceborne Astronomy, Stellar Envelopes, Stellar Luminosity, Stellar Mass Ejection
Scientific paper
The present derivation of 12-micron IR color excess for B-type dwarfs in the IV and V luminosity classes, on the basis of IRAS observations, notes a large IR color excess for most of these stars. An examination of the relation between IR color excess and v sin i shows a clear tendency in B0-B4 type stars with low v sin i values to exhibit no excess, while the fraction of stars with large IR excesses increases toward high v sin i values. It is suggested that rotation facilitates the presence of a circumstellar shell, although other mechanisms determine whether or not a star is a Be star. Once a shell has come into existence, there is no correlation between v sin i and IR color excess.
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