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Balmer Emission Profiles in Radially Pulsating Stars: The Case of the Double Hα Emission

Published online by Cambridge University Press:  19 July 2016

D. Gillet
D. Gillet*
Affiliation:
Observatoire de Haute-Provence, 04870 Saint Michel l'Observatoire, France

Abstract

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We present new high resolution profiles of Ha emissions in radially pulsating stars (RR Lyrae, W Virginis, RV Tauri, Mira stars and Classical Cepheids). Depending on phase, these profiles can show an apparent absorption within the emission close to the Hα laboratory wavelength. The origin of this feature is discussed in the framework : (a) of a composite of a single emission and a deep photospheric absorption (RR Lyrae, W Virginis and RV Tauri stars); (b) of a true absorption caused by cool hydrogen above the shock wave producing the emission; (c) of a geometric model in which the absorption is a lack of emission. Recent observations (Hα profiles of Mira stars S Car and T Cen), which show that the absorption dip is below the continuum level, are in favour of the true absorption model.

Type
III. Stars
Information
Symposium - International Astronomical Union , Volume 132: The Impact of Veryhigh S/N Spectroscopy on Stellar Physics , 1988 , pp. 143 - 148
Copyright
Copyright © Kluwer 1988 

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