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FeII And FeIII Lines As a Diagnostic of the Physical Conditions in the Atmospheres of Be Stars

Published online by Cambridge University Press:  23 September 2016

G.B. Baratta ,
M. Friedjung ,
G. Muratorio  and
R. Viotti
G.B. Baratta
Affiliation:
Osservatorio Astronomico, Roma, Italy
M. Friedjung
Affiliation:
Institut d'Astrophysique, Paris, France
G. Muratorio
Affiliation:
Observatoire de Marseille, Marseille, France
R. Viotti
Affiliation:
Istituto Astrofisica Spaziale, CNR, Frascati, Italy

Abstract

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Fell lines are frequently observed in the optical spectra of early type emission line stars. Space observations of their ultraviolet spectra led to the discovery of a considerable line absorption due to ionized metal lines formed in the stellar envelopes. We describe some examples and show that spectral synthesis is required especially for the analysis of the low resolution spectra, and may provide information about the structure of the envelopes and the mass loss rates. We also discuss the Felll lines in the UV spectra of a Herbig Be star and of β Lyrae.

Type
III. The Circumstellar Gas
Information
International Astronomical Union Colloquium , Volume 92: Physics of Be Stars , August 1987 , pp. 263 - 264
Copyright
Copyright © Cambridge University Press 1987

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