Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apjs...53..869s&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 53, Dec. 1983, p. 869-892.
Astronomy and Astrophysics
Astronomy
61
A Stars, B Stars, F Stars, Late Stars, Shell Stars, Stellar Envelopes, Stellar Spectra, Ultraviolet Astronomy, Iue, Stellar Mass Ejection, Stellar Winds, Ultraviolet Spectra
Scientific paper
High-dispersion IUE spectra of 18 later type Be and A-F type shell stars as well as eight standard nonemission line stars have been analyzed for anomalous ionization and mass loss effects. It is found that superionization in the Be stars extends to the latest spectral subtypes but does not seem to be present in the A-F type stars. The superionized lines in the Be stars appear to be correlated with v sin i. Asymmetrical or violet-displaced resonance lines suggesting mass loss are observed in all the Be stars except one, in some of the standard stars, but not in the A-F stars. Lower limits to the mass loss rates computed from Si IV lines range between 5.3 x 10 to the -12th and 3.5 x 10 to the -11th solar masses/yr, with Be shell stars showing the largest values. Mass loss is correlated with luminosity and effective temperature but not with rotation.
Carpenter Kenneth G.
Slettebak Arne
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