Highly ionized species and circumstellar shells in B8-A1 stars

Details Highly ionized species and circumstellar shells in B8-A1 stars Highly ionized species and circumstellar shells in B8-A1 stars

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340.1038b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 15, 1989, p. 1038-1048.

Astronomy and Astrophysics

Astrophysics

14

A Stars, B Stars, Shell Stars, Stellar Envelopes, Absorption Spectra, Chromosphere, Iue, Photoionization, Stellar Oscillations

Scientific paper

The nature of the C IV and Si IV absorption seen in the spectra of apparently normal late-type B and early-type A stars located within 200 pc of the sun was investigated by examining a total of 93 archival IUE spectra of 41 stars. In three of these objects, variable or asymmetric C IV profiles indicate that the absorption features have a stellar origin. One star, HD 119921, showed shortward-shifted discrete C IV and Si IV absorption components similar to those observed in Be stars. All of the stars with detected C IV in their spectra had large values of v sin i. Four of the stars showing C IV and Si IV also showed sharp absorption features in Si II, with two of these stars displaying variable Si II features. These results strongly suggest that these stars are unidentified Be/Ae and shell stars.

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