Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104.1193m&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 682, p. 1193-1204.
Astronomy and Astrophysics
Astronomy
29
Globular Clusters, Red Giant Stars, Stellar Atmospheres, Stellar Composition, Abundance, Error Analysis, Metallicity, Spectral Line Width
Scientific paper
High-resolution, high SNR echelle spectra of three red giants in the metal-poor globular cluster NGC 2298 have been obtained. An abundance analysis of the numerous Fe lines yields Fe/H = 1.91 +/- 0.1, relative to a solar Fe abundance of 7.52. The Fe-peak elements follow Fe closely, with the possible exceptions of Sc and Co, which are found to be mildly enhanced. Spectrum synthesis of the forbidden O I line at 6300 A reveals O/Fe = 0.2 +/- 0.2, with all three stars having the same ratio within the errors. This ratio is somewhat lower than, but in agreement with, typical values found for similarly metal-deficient stars. Composition results are used to correct previous age estimates for NGC 2298. Ages are found spanning the range 14-18 Gyr, dependent on the choice of CMD, cluster parameters, and interpolation of the isochrone.
Geisler Doug
McWilliam Andrew
Rich Robert Michael
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