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Variability of the Hα Emission in the Be Star o Andromedae

Published online by Cambridge University Press:  12 April 2016

E. Panko  and
A. Tarasov
E. Panko
Affiliation:
Nikolaev Pedagogical University, Nikolaev, 327030, Ukraine
A. Tarasov
Affiliation:
Crimean Astrophysical Observatory, Nauchny, Crimea, 334413, Ukraine

Abstract

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The parameters of the Hα line profile of the Be star o And were determined from observations carried out during the period 1985 - 1998. At this time the line has undergone significant changes – from a pure absorption photospheric profile with no sign of an envelope in 1985 to the transition into the shell phase with a very narrow and deep absorption component in 1989. During 1991 - 1998 the Hα emission remained at the level achieved in 1989. The line profile showed short-term changes. The envelope development in the time interval 1985 - 1998 does not confirm the previously found period of 8.5 years.

Type
6. Disks
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 543 - 546
Copyright
Copyright © Astronomical Society of the Pacific 2000

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