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Spectral Characteristics of RV Tauri Stars

Published online by Cambridge University Press:  25 May 2016

Sunetra Giridhar
Sunetra Giridhar*
Affiliation:
Indian Institute of Astrophysics, Bangalore, India

Abstract

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Spectroscopic properties of RV Tau variables are summarized. We report on our detailed spectroscopic investigation of a sample of RV Tau stars covering all three RV Tau subgroups. Though the observed abundance pattern is similar to those of a few post-AGB stars, we find considerable variation in the observed chemical compositions indicating that there is some non-homogeneity among subgroups of RV Tau variables. Possible scenarios of dust-gas separation in the material ejected by the dusty wind are discussed to explain the observed abundances. This mechanism would work better if the star happens to possess a binary companion. Interestingly, one of our sample stars, EP Lyr, shows long-term variations in radial velocity possibly caused by the presence of a companion.

Type
Session III — Observed Spectra and Energy Distributions
Information
Symposium - International Astronomical Union , Volume 177: The Carbon Star Phenomenon , 2000 , pp. 117 - 125
Copyright
Copyright © Kluwer 2000 

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