Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...359..138t&link_type=abstract
Astronomy and Astrophysics, v.359, p.138-142 (2000)
Astronomy and Astrophysics
Astrophysics
19
Stars: Abundances, Stars: Fundamental Parameters, Stars: Individual: Hd 179821, Stars: Agb And Post-Agb
Scientific paper
A LTE analysis of medium resolution spectra of {HD 179821} has been made. Derived atmospheric parameters of {HD 179821} are T_eff=5660 K, log g=-1.0 and [Fe/H]=-0.5. The position of the star in the H-R diagram, its high radial velocity (Vr=100 km s-1), its far infrared excess similar to PNe and its chemical composition suggest that {HD 179821} is a low mass post-AGB carbon-poor supergiant and not a population I massive red supergiant. The underabundance of carbon and of the s-process element zirconium shows that HD 179821 has not gone through the third dredge-up. We emphasize the similarity of the chemical pattern of the post-AGB star HD 179821 and the C-poor halo PN DDDM-1. Based on observations obtained at the Observatoire de Haute-Provence, France
Jasniewicz Gerard
Parthasarathy Mudumba
Thévenin Frédéric
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