SIMBAD references

2011AJ....141..102K - Astron. J., 141, 102 (2011/March-0)

[O/Fe] estimates for carbon-enhanced metal-poor stars from near-infrared spectroscopy.

KENNEDY C.R., SIVARANI T., BEERS T.C., LEE Y.S., PLACCO V.M., ROSSI S., CHRISTLIEB N., HERWIG F. and PLEZ B.

Abstract (from CDS):

We report on oxygen abundances determined from medium-resolution near-infrared 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 (AGB) 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 AGB companion.

Abstract Copyright:

Journal keyword(s): Galaxy: halo - stars: abundances - stars: AGB and post-AGB - stars: Population II - techniques: spectroscopic

Simbad objects: 58

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2011AJ....141..102K and select 'bookmark this link' or equivalent in the popup menu


2020.09.30-21:08:43

© Université de Strasbourg/CNRS

    • Contact