Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...290..897c&link_type=abstract
Astronomy and Astrophysics 290, 897-905 (1994)
Astronomy and Astrophysics
Astrophysics
37
Stars: Abundances, Stars: Post-Agb, Stars: Barnard 29, Stars: Population Ii, Stars: Evolution
Scientific paper
We present a model atmosphere analysis for the relatively bright (V~13) globular cluster post-AGB star, Barnard 29, using IUE and high resolution (0.06A FWHM) optical spectra. The derived atmospheric parameters are T_eff_=20000+/-1000K and logg=3.0+/-0.1dex, which imply a current mass of ~0.55Msun_. The chemical composition provides important constraints on the post-AGB evolutionary stage. We find an overall metal deficiency of 1.46+/-0.11dex, which is compatible with the mean [Fe/H] obtained from previous M13 studies. The most interesting feature is the severe carbon deficiency of more than 2.0dex which has also been observed in a number of high latitude B-type low gravity stars. Hence the present results supports the recent classification of these objects as hot post-AGB stars. Relative to the overall metallicity, the observed carbon deficiency of Barnard 29 coupled with a significant nitrogen overabundance indicates that this star has left the AGB before the third dredge-up has occurred. The implications for AGB and post-AGB evolution are briefly discussed.
Conlon E. S.
Dufton Philip L.
Keenan Francis P.
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