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On the Formation of Hydrogen Emission Lines in Miras

Published online by Cambridge University Press:  12 April 2016

Patrick de Laverny  and
Christian Magnan
Patrick de Laverny
Affiliation:
Uppsala Astronomical Observatory, Box 515, S-75120 Uppsala, Sweden. GRAAL, Universite Montpellier II, France
Christian Magnan
Affiliation:
GRAAL, cc72, Université Montpellier II, 34000 Montpellier, FranceCollege de France.

Abstract

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We investigate non-LTE effects in the hydrogen recombination zone of Long-Period Variables of Mira type. We propose that the Balmer hydrogen emission lines could be formed in this deep layer. We show how the spectral cyclic variations of Miras could be mimicked with this interpretation. As a result the radius of a Mira in the Balmer transitions could be much smaller than its radius in the molecular absorptions, which are formed in higher layers.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 155: Astrophysical Applications of Stellar Pulsation , 1995 , pp. 419 - 420
Copyright
Copyright © Astronomical Society of the Pacific 1995

References

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