Oxygen Abundances in NGC 6397 Giant Stars

Details Oxygen Abundances in NGC 6397 Giant Stars Oxygen Abundances in NGC 6397 Giant Stars

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.2914b&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #29.14; Bulletin of the American Astronomical Society, Vol. 24, p.775

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Scientific paper

The Anglo-Australian Telescope has been used to obtain spectra in the 2 micron region for two giant stars in the very metal poor globular cluster NGC 6397. The spectra show that the CO bands are very weak. Analysis of these bands indicates that the carbon abundances are very low e.g. [C/Fe] -0.8, confirming the results from an earlier analysis of the CH bands. In addition, the CO analysis gives oxygen abundances of [O/Fe] - 0.4 with an error of about 0.4, in disagreement with analyses of extreme population II subdwarfs and halo giants, but in better agreement with results from high dispersion spectroscopy of some giants in two other low metallicity globular clusters.

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