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Astron. Astrophys. 326, 1069-1075 (1997)

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More light on RV Tauri variables *

S.C. Russell

Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland (sr@cp.dias.ie)

Received 10 April 1997 / Accepted 23 May 1997

Abstract

This study confirms the results of the preliminary study (Russell, 1997) indicating that RV Tau variables in globular clusters don't show the kind of anomalous abundances seen in RV Tau variables observed in the field. By making comparisons with red giants in the same clusters, it has been possible, for the first time, to identify precisely how each element deviates from the normal abundance ratios of evolved giants.

The apparent systematic deficiency in s-process elements reported for RV Tau variables in the literature is not confirmed in the present study. Either the stars observed here are of such low metallicity, that what ever process causes s-process deficiencies in more metal rich field stars doesn't operate; or the systematic deficiency in s-process elements is simply an illusion of small number statistics.

Key words: stars: abundances - stars: asymptotic, post-asymptotic giant branch (AGB, post-AGB) - stars: variables: other - globular clusters: general

* Tables 5, 6, 7, 9, and 10 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998
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