SIMBAD references

1998A&A...337..216Z - Astronomy and Astrophysics, volume 337, 216-222 (1998/9-1)

The chemical composition of HD 196944: a carbon and s-process rich, very metal-poor star.


Abstract (from CDS):

An LTE abundance analysis of the post-AGB candidate star HD 196944 is presented based on high resolution, high S/N spectra. The radial velocity of HD 196944 is found to be -174km/s indicating that it belongs to the halo population. The spectroscopic analysis provides the atmospheric parameters Teff=5250K, logg=1.7(cgs), ξt=1.9km/s corresponding to those for G2-5 (bright) giants. A low iron abundance, [Fe/H]=-2.45, is derived confirming the old, low mass nature of the star. With [C/Fe]=+1.4 and a mean s-process overabundance of [s/Fe]=+1.1 the peculiar atmospheric composition of HD 196944 is confirmed. Possible evolutionary stages of HD 196944, that can explain its atmospheric parameters and composition, are discussed.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: abundances - stars: chemically peculiar - stars: AGB and post-AGB - stars: individual: HD 196944

Simbad objects: 11

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