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| Paper: |
Detailed Abundances in Extremely Metal Poor Dwarf Stars Extracted from SDSS |
| Volume: |
458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way |
| Page: |
69 |
| Authors: |
Sbordone, L.; Bonifacio, P.; Caffau, E.; Ludwig, H.-G. |
| Abstract: |
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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