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Variability of Some Be Stars on High-Resolution, High S/N Spectra

Published online by Cambridge University Press:  19 July 2016

A. M. Hubert ,
H. Hubert ,
B. Dagostinoz  and
M. Floquet
A. M. Hubert
Affiliation:
DASGAL et UA 337, Observatoire de Paris, Section d'Astrophysique de Meudon, F-92195, Meudon Cedex, France
H. Hubert
Affiliation:
DASGAL et UA 337, Observatoire de Paris, Section d'Astrophysique de Meudon, F-92195, Meudon Cedex, France
B. Dagostinoz
Affiliation:
DASGAL et UA 337, Observatoire de Paris, Section d'Astrophysique de Meudon, F-92195, Meudon Cedex, France
M. Floquet
Affiliation:
DASGAL et UA 337, Observatoire de Paris, Section d'Astrophysique de Meudon, F-92195, Meudon Cedex, France

Abstract

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Rapid variability in Be stars could be understood by non radial pulsations or by rotation of an inhomogeous surface brightness distribution…

The structure and the variability of the Hα and of the HeI λ6678 lines have been investigated with an optical fiber spectrograph and a CCD camera. The signal to noise ratio, measured in the continuum, is between 300 and 500.

Weak changes in the Hα emission line profile of γ Cas have been detected on time-scale of hours and days. This line has an asymmetric profile exhibiting only one blue-shifted maximum while the HeI λ6678 has a double-peak emission, superimposed to the photospheric contribution, with a violet to red peak ratio V/R >1.

The Hα emission line of φ Per exhibits a complex structure with significant changes in its core, from night to night and on a short time scale <lhr. The HeI λ6678 presents a blue-shifted asymmetric emission (red-winged) superimposed to the photospheric contribution.

Furthermore the Hel photospheric line λ6678 of the B6 star o And has presented notable variations in its profile during the 2 observational campaigns, which do not seem correlated to the photometric period of 1.57 day.

Type
III. Stars
Information
Symposium - International Astronomical Union , Volume 132: The Impact of Veryhigh S/N Spectroscopy on Stellar Physics , 1988 , pp. 131 - 134
Copyright
Copyright © Kluwer 1988 

References

Chalabaev, A., Maillard, J.P.: 1983, Astron. Astrophys. 127, 279 Google Scholar
Felenbok, P., Guérin, J., Czarny, J.: 1986, Colloque ESO/OHP sur les CCD Google Scholar
Harmanec, P.,: 1984, IAU Inf. Bull. Var. Stars N°2506.Google Scholar