Chemical Composition of Globular Cluster and Halo Post-AGB Stars

Details Chemical Composition of Globular Cluster and Halo Post-AGB Stars Chemical Composition of Globular Cluster and Halo Post-AGB Stars

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxac..12..181m&link_type=abstract

Ionized Gaseous Nebulae, a Conference to Celebrate the 60th Birthdays of Silvia Torres-Peimbert and Manuel Peimbert, Mexico City

Other

Stars: Abundances, Stars: Agb And Post-Agb, Stars: Early-Type, Stars: Population Ii

Scientific paper

We present results of model atmosphere analyses of two post-AGB stars, ZNG-1 in the globular cluster M10 and the halo star PG1704+222. A differential abundance analysis reveals typical post-AGB abundance patterns, both stars being generally metal poor with approximately solar He. Large C depletions, observed in all hot post-AGB objects, are confirmed. The C deficiency may suggest that hot post-AGB stars evolve off the AGB before the third dredge-up begins. However, Fe depletions observed in other similar stars suggest that gas-dust fractionation in the AGB progenitor is responsible for the observed composition of these objects.

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