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Pulsations in 66 Oph: Multiperiodicity in He I 6678

Published online by Cambridge University Press:  12 April 2016

M. Floquet ,
C. Neiner ,
D. Briot ,
J. Chauville ,
A.M. Hubert  and
D. Ballereau
M. Floquet
Affiliation:
Dasgal, UMR8633, Observatoire de Meudon, 92195 - Meudon Cedex, France
C. Neiner
Affiliation:
Dasgal, UMR8633, Observatoire de Meudon, 92195 - Meudon Cedex, France
D. Briot
Affiliation:
Dasgal, UMR8633, Observatoire de Meudon, 92195 - Meudon Cedex, France
J. Chauville
Affiliation:
Dasgal, UMR8633, Observatoire de Meudon, 92195 - Meudon Cedex, France
A.M. Hubert
Affiliation:
Dasgal, UMR8633, Observatoire de Meudon, 92195 - Meudon Cedex, France
D. Ballereau
Affiliation:
Dasgal, UMR8633, Observatoire de Meudon, 92195 - Meudon Cedex, France

Abstract

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66 Oph has shown recurrent short-lived outbursts nicely detected from ground-based and space (Hipparcos) photometry.

Spectroscopic observations of He I 6678 and Hα lines were performed in June 1997 and June 1998. Search for short-term periodicities was done in He I 6678 line profiles as in equivalent width EW, radial velocity of the line centroid, and V and R components. At least two frequencies were present: ν = 4.0 c/d and ν = 2.2 c/d. The phase distribution of these frequencies over the line profile corresponds in the nrp frame to g-modes with ℓ ~ 3 − 4 and ℓ = 2 respectively.

Information

Type
3. Periodic Variations
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 256 - 259
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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