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The Be Phenomenon in Pleione

Published online by Cambridge University Press:  12 April 2016

Ryuko Hirata ,
Michihiro R. Shimada ,
Seiji Masuda  and
Jun-ichi Katahira
Ryuko Hirata
Affiliation:
Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan
Michihiro R. Shimada
Affiliation:
Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan
Seiji Masuda
Affiliation:
Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan
Jun-ichi Katahira
Affiliation:
Science Education Center of Sakai City, Sakai, Osaka 599-8273, Japan

Abstract

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The spectral change of Pleione in the present Be phase (1988-1999) is briefly described. The Hα emission reached its maximum in 1995-1999. The V/R values of Hγ and metallic lines changed from V/R < 1 in 1995 to V/R > 1 in 1998-1999. The broad component of Mg II λ4481 line further weakened in Be phase.

The long-term variation in 1968-1999 is shown for several observational quantities. These quantities which reflect various levels from the photosphere up to the outer envelope did not change in a parallel way. The basic unsolved problems are pointed out.

Type
6. Disks
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 558 - 561
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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