New r-process Enhanced Stars Found in the HK-II Survey

Details New r-process Enhanced Stars Found in the HK-II Survey New r-process Enhanced Stars Found in the HK-II Survey

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..336..351r&link_type=abstract

Cosmic Abundances as Records of Stellar Evolution and Nucleosynthesis in honor of David L. Lambert, ASP Conference Series, Vol.

Astronomy and Astrophysics

Astronomy

Scientific paper

We have initiated a program to obtain high-resolution spectroscopy for very metal-poor giant stars newly discovered from the HK-II survey, and performed pilot observations with KPNO 4m/Échelle & Magellan 6.5m/ MIKE in May 2004. We report on the result of the initial analysis for 6 spectra with S/N > 55 per pixel at 4130 Å (Eu II). Although the eventual goal is to study comprehensive abundance patterns of α, iron-peak, r-process, and s-process elements for the stars, we focus on an r-process element abundance [Eu/Fe] as the first step. A preliminary analysis indicates that we may have newly discovered a highly r-process enhanced metal-poor star, II 16033-02187, a giant with [Fe/H] = -2.48 and [Eu/Fe] = +1.6, and two moderately r-process-enhanced metal-poor stars, II 16552-07661/II 16552-04461, giants with [Fe/H] = -1.75/-1.98 and [Eu/Fe] = +0.9/+0.7.

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