Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21547805s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #478.05; Bulletin of the American Astronomical Society, Vol. 42, p.566
Astronomy and Astrophysics
Astronomy
Scientific paper
According to standard formation models, Galactic globular clusters are expected to display relatively little star-to-star variations in their elemental abundances. However, observations continue to reveal that this is not the case. We present results of a CN and CH abundance analysis of stars from the base to the tip of the red-giant branch in six globular clusters using photometric and spectroscopic data from SDSS-I and SDSS-II/SEGUE, while demonstrating further validation of the SEGUE Spectral Parameter Pipeline. An overall bimodality in the CN distribution is seen on the RGB along with a general anti-correlation between carbon and nitrogen, similar to previous studies. Stars on the main sequence and sub-giant branch are also examined to provide insight into the origination of these observations. These clusters are then combined with a second sample of 5 clusters to produce a spectroscopic sample of over 700 member stars spanning 11 globular clusters.
An Deokkeun
Beers Timothy C.
Lee Young Sam
Sivarani Thirupathi
Smolinski Jason P.
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