Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....126.2372f&link_type=abstract
The Astronomical Journal, Volume 126, Issue 5, pp. 2372-2384.
Astronomy and Astrophysics
Astronomy
44
Galaxy: Abundances, Open Clusters And Associations: Individual (Collinder 261), Stars: Abundances
Scientific paper
We present an analysis of high-dispersion echelle spectra of four giant stars in the 8 Gyr open cluster Cr 261 obtained with the Cerro Tololo Inter-American Observatory's 4 m telescope. Abundances were determined relative to the bright, slightly metal-poor disk giant Arcturus. Cr 261 is found to have a mean [Fe/H]=-0.22+/-0.05 (mean error). Oxygen abundances, determined from the forbidden [O I] lines, show roughly solar or slightly depleted abundance ratios. The α-elements Mg, Ca, and Ti also show scaled solar abundance ratios, with suggestions that the Si abundance is slightly enhanced. The odd-Z elements Na and Al are significantly enhanced relative to scaled solar abundances. The abundance results for Cr 261 are compared with those from high-dispersion studies of other old open clusters in the literature, which, overall, show similar behavior in all these elements. None of the abundance ratios show significant trends with overall cluster [Fe/H] or with cluster age.
Balachandran Suchitra C.
Barrett Elizabeth
Friel Eileen D.
Fullton Laura
Jacobson Heather R.
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