Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..860s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 15, 1986, p. 860-867.
Astronomy and Astrophysics
Astrophysics
11
Carbon Isotopes, Giant Stars, Star Clusters, Stellar Composition, Abundance, Asymptotic Giant Branch Stars, Carbon 12, Carbon 13, Cn Emission, K Stars, Lithium, Open Clusters, Stellar Envelopes, Stellar Spectra, Stellar Temperature
Scientific paper
Carbon isotope ratios have been derived for seven giant stars in the old open cluster NGC 7789. High-resolution, high signal-to-noise spectra of the CN red system bands in these stars were obtained with the KPNO 4 m Cassegrain echelle spectrograph and a CCD camera. (C-13)N features were detected easily in all cluster stars, and isotope ratios in the range C-12/C-13 = 10-30 were derived. The isotope ratios of most stars are normal for K giants possessing convective envelopes and show no correlations with effective temperatures and with lithium abundances. However, one cluster star has both very high lithium and the lowest carbon isotope ratio. It is speculated that this star either is an asymptotic giant branch star or a weak G-band star.
Pilachowski Catherine A.
Sneden Chistopher
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