An Abundance Analysis of Two S Stars at High Galactic Latitude

Details An Abundance Analysis of Two S Stars at High Galactic Latitude An Abundance Analysis of Two S Stars at High Galactic Latitude

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasp..115.1367v&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 115, Issue 814, pp. 1367-1374.

Astronomy and Astrophysics

Astronomy

1

Stars: Abundances, Stars: Agb And Post-Agb, Stars: Evolution

Scientific paper

We present abundances of Ti, Fe, and Ni as well as 10 post-iron-peak elements in two Galactic S stars, S UMa and Stephenson 1303. Based upon the presence or absence of Tc in their spectra, S UMa is an intrinsic S star and Stephenson 1303 is an extrinsic S star. Both stars are slightly metal-poor and at high Galactic latitude; they thus make an interesting comparison as well as a further test of current models of nucleosynthesis in low-mass stars. In addition, the abundance ratio of heavy to light s-process elements, [hs/ls], correlates with the metallicities of Stephenson 1303 and S UMa as expected if the 13C neutron source drives the s-process.

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