Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715311k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #153.11; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The metal-poor population II stars in the Galactic halo formed during the first few generations of star formation following the Big Bang, and can thus provide key insights into conditions in the early Universe. Carbon-enriched metal-poor (CEMP) stars, a subset of this population, are of even further interest because of their peculiar chemical abundance patterns. High-resolution spectra of ten known CEMP stars were obtained on the Keck High Resolution Echelle Spectrometer (HIRES) for this study. Stellar parameters for our model atmospheres were determined using Fe I and Fe II equivalent width measurements. We derived chemical abundances from measured equivalent widths whenever possible, or from synthetic spectra in the cases where no equivalent widths could be measured for an element's spectral lines. Using these methods, we have obtained preliminary abundances for up to 28 elements in our sample. Further work remains in introducing carbon into the model atmospheres and repeating the abundance analysis using these revised models. We can then study the relative abundances of heavy elements in comparison to solar system r-process and s-process abundance patterns in order to infer possible mechanisms by which these stars became carbon-enriched.
Bolte Michael
Johnson Jesse
Kwa Anna
Lai Dong
Lucatello Sara
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