Chemical Compositions of RV Tauri Stars and Related Objects
Abstract
We have undertaken a comprehensive abundance analysis for a sample of relatively unexplored RV Tauri and RV Tauri like stars to further our understanding of post-Asymptotic Giant Branch (post-AGB) evolution. From our study based on high resolution spectra and grid of model atmospheres, we find indications of mild s-processing for V820 Cen and IRAS 06165+3158. On the other hand, SU Gem and BT Lac exhibit the effects of mild dust-gas winnowing. We have also compiled the existing abundance data on RV Tauri objects and find that a large fraction of them are afflicted by dust-gas winnowing and now added by the present work, we find a small group of two RV Tauris showing mild s-process enhancement in our Galaxy. With two out of three reported s-process enhanced objects belonging to RV Tauri spectroscopic class C, these intrinsically metal-poor objects appear to be promising candidates to analyse the possible s-processing in RV Tauri stars.
Keywords
Cite
@article{arxiv.1311.6496,
title = {Chemical Compositions of RV Tauri Stars and Related Objects},
author = {S. Sumangala Rao and Sunetra Giridhar},
journal= {arXiv preprint arXiv:1311.6496},
year = {2013}
}
Comments
18 Pages, 6 Figures, Accepted for Publication in Revista Mexicana de Astronomia y Astrofisica (RevMexxAA), Will appear in Vol.50, No. 1, April, 2014 issue of the Journal