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Shell profiles in Be star spectra

Published online by Cambridge University Press:  26 May 2016

R. W. Hanuschik*
Affiliation:
Astronomical Institute, Ruhr-Universität, D-44780 Bochum, Germany

Extract

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Although very different in shape, Be-type and Be-shell-type spectral lines are thought to arise from the same kind of circumstellar environment, a disklike envelope. The only discrimination between these two types of spectra is the inclination angle: If sufficiently high, a large column depth of circumstellar material causes partial obscuration of the stellar disk, i.e. shell absorption; otherwise a pure emission line is observed. A shell line can be considered as equivalent to P Cygni-type absorption trough for different geometry (disk instead of sphere) and kinematics (rotation instead of outflow; see Hanuschik, these proceedings).

Type
6. Be Stars: Circumstellar Environment
Copyright
Copyright © Kluwer 1994 

References

Doazan, V., Sedmak, G., Barylak, M., Rusconi, L.: 1991, ESA SP-1147.Google Scholar
Hanuschik, R.W. et al.: 1994, in preparation.Google Scholar
Hummel, W.: Ph. D. thesis (Bochum).Google Scholar