Detailed abundances in extremely metal poor dwarf stars extracted from SDSS

Details Detailed abundances in extremely metal poor dwarf stars extracted from SDSS Detailed abundances in extremely metal poor dwarf stars extracted from SDSS

2012-01-05

arxiv.org/abs/1201.1044v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 pages, 1 figure, to appear in the proceedings of the 3rd Subaru Conference on Galactic Archaeology, to be published in the A

Scientific paper

We report on the result of an ongoing campaign to determine chemical abundances in extremely metal poor (EMP) turn-off (TO) stars selected from the Sloan Digital Sky Survey (SDSS) low resolution spectra. This contribution focuses principally on the largest part of the sample (18 stars out of 29), observed with UVES@VLT and analyzed by means of the automatic abundance analysis code MyGIsFOS to derive atmosphere parameters and detailed compositions. The most significant findings include i) the detection of a C-rich, strongly Mg-enhanced star ([Mg/Fe]=1.45); ii) a group of Mn-rich stars ([Mn/Fe]>-0.4); iii) a group of Ni-rich stars ([Ni/Fe]>0.2). Li is measured in twelve stars, while for three upper limits are derived.

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