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Dust Formation and the Doubly-Periodic Variable Stars

Published online by Cambridge University Press:  12 April 2016

T. Lloyd Evans
T. Lloyd Evans*
Affiliation:
South African Astronomical Observatory, P. O. Box 9, Observatory 7935, South Africa

Abstract

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The doubly-periodic semiregular variable V Hydrae became redder and developed resonance emission lines and bands during the 1992-94 deep minimum, which therefore resulted from the production of a circumstellar dust cloud. This removes the need to postulate a secondary pulsation period, ten times as long as the main pulsation period, in the stellar as opposed to circumstellar envelope.

Type
Part 1. The Scientific Programme
Information
International Astronomical Union Colloquium , Volume 155: Astrophysical Applications of Stellar Pulsation , 1995 , pp. 196 - 197
Copyright
Copyright © Astronomical Society of the Pacific 1995

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