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Rapid Variations of the Hα Line of the Be Star o And

Published online by Cambridge University Press:  12 April 2016

D. Briot ,
J. Chauville  and
G. Guerrero
D. Briot
Affiliation:
Observatoire de Paris-Meudon, France
J. Chauville
Affiliation:
Observatoire de Paris-Meudon, France
G. Guerrero
Affiliation:
Osservatorio di Brera, Italy

Extract

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Omicron Andromedae is a multiple system composed of at least four components. The main component “A” is a variable Be star (B5II-III). The variations of this star are multiform: the circumstellar emission and absorption can vary drastically and can even disappear and reappear later, whereas changes in magnitude are also observed (see e.g. Sareyan et al., 1998). Rapid Spectroscopic and photometric variations are observed as well. As explained below, the rapid Spectroscopic variations of the Hα line observed in 1992 during a phase of moderate emission are very special (Briot et al., 2001). Then the emission of о And increased, so another program of observations of the Hα line was performed to investigate its rapid variations during different emission phases. We present here some preliminary results.

Type
Part 2.2. B-Type Stars
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 250 - 251
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

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