Other
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1117l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, May 1986, p. 1117-1120.
Other
34
Charge Coupled Devices, Globular Clusters, Oxygen Spectra, Stellar Spectra, Stellar Spectrophotometry, Abundance, High Resolution, Iron, Spectrum Analysis
Scientific paper
High-resolution (0.3 A) CCD spectra obtained at the 200 in. coude spectrograph have been analyzed for the abundances of O, Sc, Fe, and La in four stars in the globular cluster M13. Fe/H abundance is found to be = -1.6, as found by many other observers of this cluster. For three stars O/Fe abundance is found to be = +0.3 + or - 0.1, which is similar to O/Fe ratios in other globular clusters and metal-poor field stars. For star II-67, no oxygen line is visible at 6300 A and O/Fe abundance is found to be not greater than -0.4 (for a high carbon content) and not greater than -0.7 (for a low carbon content). The latter is more likely to be correct. Two possible explanations of the oxygen deficiency in II-67 are discussed: primordial deficiency, and CNO cycling at or above a temperature of 25,000,000 K.
Leep Myckky E.
Oke Bev J.
Wallerstein George
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