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The Be star phenomena. II - Spectral formation and structure of envelopes

Hirata, R.; Kogure, T.

The mechanisms of formation of the continuum and line spectra of Be stars and the morphology of their cool and hot envelopes are discussed in a review of recent theoretical and observational studies, supplementing the statistical evaluation of Kogure and Hirata (1982). Topics examined include the rapid rotation of Be stars, envelope dynamics, radi…

CA II K emission in Canopus.

Bappu, M. K. V.; Mekkaden, M. V.; Rao, N. K.

The changes in the Ca II K line profile of the F0 supergiant Canopus have been studied from the high dispersion coude spectrograms obtained since 1975. The emission in the core of the line is variable in a timescale of few days. Similar activity seems to be occurring in Mg II h and k lines also. This is attributed to the variability in the appeara…