HD 196944 : A Carbon and s-Process Rich, Very Metal-Poor Star

Details HD 196944 : A Carbon and s-Process Rich, Very Metal-Poor Star HD 196944 : A Carbon and s-Process Rich, Very Metal-Poor Star

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.6710s&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #67.10; Bulletin of the American Astronomical Society, Vol. 30, p.919

Astronomy and Astrophysics

Astronomy

Scientific paper

High resolution, high S/N spectra and an LTE abundance analysis are used to examine the post-AGB candidate star HD 196944. The spectroscopic analysis gives T_eff = 5250 K, log g = 1.7 (cgs), and xi_t = 1.9 km/s, corresponding to a G2-5 (bright) giant. A low iron abundance, [Fe/H] = -2.45, is derived, and this, together with the star's kinematics, indicates that HD 196944 belongs to the halo population. With [C/Fe] = +1.4, [O/Fe] = +1.1 and a mean s-process overabundance of [s/Fe] = +1.1, its peculiar atmospheric composition is confirmed. Alternative evolutionary states for HD 196944 are discussed.

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