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Stellar and Circumstellar Activity in the Be Star EW Lac from the Multi-site 1993 Campaign

Published online by Cambridge University Press:  12 April 2016

A.M. Hubert ,
M. Floquet ,
R. Hirata ,
D. McDavid ,
J. Zorec ,
D. Gies ,
M. Hahula ,
E. Janot-Pacheco ,
E. Kambe  and
N.V. Leister
...Show all authors
A.M. Hubert
Affiliation:
Dasgal, UMR8633 du CNRS, Observatoire de Paris-Meudon, F-92195 Meudon, France
M. Floquet
Affiliation:
Dasgal, UMR8633 du CNRS, Observatoire de Paris-Meudon, F-92195 Meudon, France
R. Hirata
Affiliation:
Department of Astronomy, Kyoto University, Kyoto 606-01, Japan
D. McDavid
Affiliation:
Limber Observatory, Timber Creek Road, P.O. Box 65599
J. Zorec
Affiliation:
Institut d’Astrophysique de Paris - CNRS, 98bis Bd Arago, 75014-Paris, France
D. Gies
Affiliation:
CHARA and Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303-3083, USA
M. Hahula
Affiliation:
CHARA and Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303-3083, USA
E. Janot-Pacheco
Affiliation:
Instituto Astronomico e Geofisico, Universidade de Sao Paulo, Caixa Postal 3386, 01060-970 Sao Paulo, Brazil
E. Kambe
Affiliation:
Department of Geoscience, National Defense Academy, Yokosuka, Kanagawa 239, Japan
N.V. Leister
Affiliation:
Instituto Astronomico e Geofisico, Universidade de Sao Paulo, Caixa Postal 3386, 01060-970 Sao Paulo, Brazil
S. Stefl
Affiliation:
Astronomical Institute, Academy of Sciences, CZ-251 65 Ondrejov, Czech Republic
A. Tarasov
Affiliation:
Crimean Astrophysical Observatory, Nauchny, Crimea, 334413, Ukraine

Abstract

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The Be shell star EW Lac was observed in September 1993 during a multi-site campaign. Results from visual spectroscopy and polarimetry are summarized here. He I 6678 profiles have been compared to previous observations held in 1989 and show an additional complex and highly variable circumstellar component which can due to material expelled from the star just prior to these observations. Two groups of frequencies are found again in 1993 observations compared with 1989 ones. In the frame of nrp, they could be associated to low degree g-modes.

Type
6. Disks
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 550 - 553
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Auer, L.H., Mihalas, D. 1973, ApJS 25, 433 Google Scholar
Hubert, A.M., Floquet, M., Hao, J.X. et al. 1997, A&A 324, 929 Google Scholar
Pavlovski, K., Harmanec, P., Božić, H. et al. 1997, A&AS 125, 75 Google Scholar