Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545508j&link_type=abstract
American Astronomical Society, AAS Meeting #215, #455.08; Bulletin of the American Astronomical Society, Vol. 42, p.474
Astronomy and Astrophysics
Astronomy
Scientific paper
We present chemical abundances for a nearly complete sample of red giant branch (RGB) stars brighter than V = 13.5 in the globular cluster Omega Centauri. The abundances were determined from moderate resolution (R 18,000), high signal-to-noise (S/N > 100) spectra obtained with the Blanco 4M telescope and Hydra multifiber spectrograph. We confirm both that the stars on the RGB have a large metallicity spread, with [Fe/H] ranging from -2.25 to -0.30, and that the dominant population of RGB stars have [Fe/H] -1.7 with the remaining stars populating a higher metallicity tail consisting of multiple peaks. Nearly all cluster stars exhibit the classical O-Na anticorrelation, but the percentage of stars with "primordial" [O/Fe] and [Na/Fe] ratios varies as a function of [Fe/H]. The higher metallicity stars are almost exclusively O-poor and Na-rich. Additionally, the [La/Eu] ratio increases rapidly with increasing [Fe/H], indicating that the s-process contributed strongly to the later generations of cluster stars.
Johnson Christian I.
Pilachowski Catherine A.
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