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Astron. Astrophys. 359, 138-142 (2000)


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Chemical composition of HD 179821 (IRAS 19114+0002) *

F. Thévenin 1, M. Parthasarathy 2 and G. Jasniewicz 3

1 Observatoire de la Côte d'Azur, B.P. 4229, 06304 Nice Cedex 4, France
2 Indian Institute of Astrophysics, Bangalore - 560034, India
3 Université de Montpellier II, GRAAL, UPRESA 5024, CC 72, 34095 Montpellier Cedex 05, France

Received 13 April 1999 / Accepted 18 May 2000

Abstract

A LTE analysis of medium resolution spectra of HD 179821 has been made. Derived atmospheric parameters of HD 179821 are [FORMULA] K, [FORMULA] 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.

Key words: stars: abundances – stars: fundamental parameters – stars: individual: HD 179821 – stars: AGB and post-AGB

* Based on observations obtained at the Observatoire de Haute-Provence, France

Send offprint requests to: F. Thévenin

© European Southern Observatory (ESO) 2000

Online publication: June 30, 2000

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