CNO Mixing in the Old Open Cluster NGC 6791

Details CNO Mixing in the Old Open Cluster NGC 6791 CNO Mixing in the Old Open Cluster NGC 6791

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..244p&link_type=abstract

NOAO Proposal ID #1999A-0244

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Scientific paper

This proposal aims to characterize the degree of mixing of the products of the CNO cycle between the early giant branch and the red horizontal branch stages of evolution in the old open cluster NGC 6791. Such mixing may be associated with processes such as internal rotation which can drive enhanced mass loss, and thus assist in the production of hot horizontal-branch stars, whose presence in NGC 6791 is otherwise difficult to explain. The CNO cycle depletes first carbon, then oxygen, producing excess nitrogen. In globular-cluster giants, this mixing is generally measured from carbon and nitrogen abundances derived from CN and CH, or from oxygen abundances deduced from the forbidden [O I] line at 6300Å. NGC 6791 is so metal-rich, however, that CN blanketing badly blends the 6300Aregion. Instead, we will use the C_2 band at 5165Ato measure changes in the carbon abundance directly. The echelle spectrograph will be used in long-slit, single-order mode to obtain high-resolution spectra of two stars simultaneously, to build a sample of four giants below the horizontal branch and four red horizontal branch stars.

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