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Title: Chemical composition of HD 179821 (IRAS 19114+0002)
Authors: Thévenin, F
Parthasarathy, M
Jasniewicz, G
Keywords: Stars: Abundances;Stars: Fundamental Parameters;Stars: Individual: Hd 179821;Stars: AGB and Post-AGB
Issue Date: Jul-2000
Publisher: European Southern Observatory
Citation: Astronomy and Astrophysics, Vol. 359, No. 1, pp.138 - 142
Abstract: A LTE analysis of medium resolution spectra of HD 179821 has been made. Derived atmospheric parameters of HD 179821 are K, 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.
ISSN: 0004-6361
Appears in Collections:IIAP Publications

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