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Rapid spectroscopic and photometric variability in the Be star Alpha Eridani

Published online by Cambridge University Press:  26 May 2016

N.V. Leister ,
E. Janot-Pacheco ,
M.T.C. Buck ,
M.P. Dias ,
A.M. Hubert ,
H. Hubert ,
M. Floquet  and
D. Briot
N.V. Leister
Affiliation:
Depto. Astronomia, IAG-USP, Brazil
E. Janot-Pacheco
Affiliation:
Depto. Astronomia, IAG-USP, Brazil
M.T.C. Buck
Affiliation:
Depto. Astronomia, IAG-USP, Brazil
M.P. Dias
Affiliation:
Depto. Astronomia, IAG-USP, Brazil
A.M. Hubert
Affiliation:
Dasgal, Obs. de Paris-Meudon, France
H. Hubert
Affiliation:
Dasgal, Obs. de Paris-Meudon, France
M. Floquet
Affiliation:
Dasgal, Obs. de Paris-Meudon, France
D. Briot
Affiliation:
Dasgal, Obs. de Paris-Meudon, France

Extract

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We present here a preliminary report on the analysis of simultaneous photometric and spectroscopic observations of the Be star α Eri, taken during 1992 at the Laboratório Nacional de Astrofísica. α Eri (Archenar, HR472, HD10144, B3–4 III-IV) is the brightest Be star in the sky. It shows activity cycles in a time scale of a few years. Balona et al. (1987) presented a comprehensive study of the star based on photometric and spectroscopic observations. They found a periodicity of 1.26 days in both radial velocity and light variations and argued that a spotted star rotating at this period is the simplest working model that explains the observations.

Type
1. Pulsation and Rotation
Information
Symposium - International Astronomical Union , Volume 162: Pulsation, Rotation and Mass Loss in Early-Type Stars , 1994 , pp. 106 - 107
Copyright
Copyright © Kluwer 1994 

References

Balona, L.A.: 1987, M.N 224, 41 Google Scholar
Floquet, M., Hubert, A.M., Janot-Pacheco, E., Mekkas, A., Hubert, H. and Leister, N.V.: 1991, A&A 264, 177 Google Scholar
Slettebak, A.: 1982, ApJS 50, 55 Google Scholar
Walker, G.A.H.: 1991, Rapid Variability of OB Stars: Nature and Diagnostic Value, ESO workshop, ed. Baade, D., 27 Google Scholar