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The Emitting Envelope of Pleione between 1987 and 19981

Published online by Cambridge University Press:  12 April 2016

D. Ballereau ,
J. Chauville ,
J. Zorec  and
N. Morrell
D. Ballereau
Affiliation:
Observatoire de Paris-Meudon - DASGAL/UMR 8633 du CNRS, F-92195 Meudon Principal Cedex, France
J. Chauville
Affiliation:
Observatoire de Paris-Meudon - DASGAL/UMR 8633 du CNRS, F-92195 Meudon Principal Cedex, France
J. Zorec
Affiliation:
Institut d’Astrophysique de Paris - CNRS - 98bis bd. Arago, F-75014 Paris, France
N. Morrell
Affiliation:
La Plata Observatory, Paseo del Bosque s/n - 1900 La Plata, Argentina

Abstract

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We analyze a series of spectroscopic observations of the Hβ and Fe II λ4924Å lines of the Be-shell star Pleione (HD23862), which entered a new Be phase since 1988. Their evolution show that the Hβ-emitting envelope expands regularly from 1987 to 1996 (r/r*=8.6 to 25.0), then diminishes slightly in 1997-98 (r/r*=20.0). The Fe II-emitting envelope expands regularly between 1987 and 1998 (r/r*=6.7 to 13.4), but remains always inside the Hβ-one. The evolution of the emitting envelope of Pleione is similar to the one observed between 1954 and 1972, and this one should decrease regularly in the next years, if the former scenario is repeated.

Type
6. Disks
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 562 - 565
Copyright
Copyright © Astronomical Society of the Pacific 2000

Footnotes

1

Data obtained at CASLEO (Argentina) and Haute-Provence (Prance) Observatories

References

Ballereau, D., Chauville, J., Mekkas, A. 1988, A&ASS 75, 139 Google Scholar
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Katahira, J., Hirata, R., Ito, M., Katoh, M., Ballereau, D., Chauville, J. 1996, PASJ 48, 317 Google Scholar