%0 Journal Article
%T [O/Fe] Estimates for Carbon-Enhanced Metal-Poor Stars from Near-IR Spectroscopy
%+ Astrophysique Stellaire
%A Kennedy, Catherine R.
%A Sivarani, Thirupathi
%A Beers, Timothy C.
%A Lee, Young Sun
%A Placco, Vinicius M.
%A Rossi, Silvia
%A Christlieb, Norbert
%A Herwig, Falk
%A Plez, Bertrand
%Z 16 pages, 8 figures, accepted by AJ
%< avec comité de lecture
%Z LUPM:11-020
%@ 0004-6256
%J The Astronomical Journal
%I American Astronomical Society
%V 141
%N 3
%P 102
%8 2011-02-11
%D 2011
%Z 1101.2260
%Z 2011AJ....141..102K
%R 10.1088/0004-6256/141/3/102
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
%Z Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]Journal articles
%X We report on oxygen abundances determined from medium-resolution near-IR spectroscopy for a sample of 57 carbon-enhanced metal-poor (CEMP) stars selected from the Hamburg/ESO survey. The majority of our program stars exhibit oxygen-to-iron ratios in the range +0.5 < [O/Fe]< +2.0. The [O/Fe] values for this sample are statistically compared to available high-resolution estimates for known CEMP stars, as well as to high-resolution estimates for a set of carbon-normal metal-poor stars. Carbon, nitrogen, and oxygen abundance patterns for a sub-sample of these stars are compared to yield predictions for very metal-poor asymptotic giant-branch abundances in the recent literature. We find that the majority of our sample exhibit patterns that are consistent with previously studied CEMP stars having s-process-element enhancements, and thus have very likely been polluted by carbon- and oxygen-enhanced material transferred from a metal-poor asymptotic giant-branch companion.
%G English
%L hal-00651242
%U https://hal.science/hal-00651242
%~ IN2P3
%~ CNRS
%~ UNIV-MONTP2
%~ LUPM
%~ MIPS
%~ UNIV-MONTPELLIER
%~ LUPM_AS
%~ UM1-UM2