A simple model of phase-changing variation between Be stars and shell stars

Details A simple model of phase-changing variation between Be stars and shell stars A simple model of phase-changing variation between Be stars and shell stars

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.163....7k&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 163, no. 1, Jan. 1990, p. 7-22.

Astronomy and Astrophysics

Astrophysics

12

B Stars, Shell Stars, Stellar Envelopes, Stellar Models, Stellar Rotation, Absorption Spectra, H Alpha Line, Line Spectra, Optical Thickness, Ultraviolet Spectra

Scientific paper

Phase changing variations between Be and shell stars are considered from the viewpoint of the formation of shell absorption lines in the envelopes of these stars. A simple model of transformation from a disk envelope of shell star to a spherical envelope of Be star is considered to show the relative volume and volume emission measures of the envelopes in both phases. The phase change variations observed in Pleione and in other Be and shell stars are discussed based on this simple consideration. Some implications of the model in the linear polarization, IR-excess, UV spectra, and the radiation field of the envelope are discussed.

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