Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.7902l&link_type=abstract
American Astronomical Society, AAS Meeting #211, #79.02; Bulletin of the American Astronomical Society, Vol. 39, p.869
Astronomy and Astrophysics
Astronomy
Scientific paper
We present analysis of Keck HIRES spectra to measure abundances in a sample of 28 stars spanning a wide range of evolutionary states with -2 > [Fe/H] > -4. We measure abundances of elements from CNO to the neutron-capture elements. Our sample includes 13 stars with [Fe/H] <-2.6, 9 of which have [Fe/H] < -3.0, including a new [Fe/H] -4.0 star, CS30336-049. We measure an abundance pattern in this star that is very similar to stars in the range [Fe/H] -3.5. We also report on a new r-process star, CS 31078-018. This star has a [Fe/H]= -2.85, [Eu/Fe] =1.29, and [Ba/Eu] =-0.57. CS 31078-018 also seems to exhibit an "actinide boost", i.e. much higher than expected logɛ(Th). Our analysis allows us to further constrain the abundance scatter at low metallicities. We also fit the zero-metallicity SNII yields of Heger & Woosley 2007 to our results, and find that progenitors with a narrow range of masses near 11 solar masses give the best fit to our average abundance pattern.
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