Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217l.101m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 217, Oct. 15, 1977, p. L101-L104.
Astronomy and Astrophysics
Astrophysics
48
Abundance, Carbon Stars, Globular Clusters, Nuclear Fusion, Stellar Spectra, Anomalies, Cn Emission, Light (Visible Radiation)
Scientific paper
Spectroscopic evidence is presented that the star III-106 in the globular cluster M22 is a CH star, as suggested previously from photometry. CH stars have now been found in two globular clusters, M22 and Omega Cen, both of which possess relatively low concentration for their masses. It is suggested that searches for CH stars in the low-concentration clusters M14 and NGC 2419 might be profitable. The CN anomalies in globular-cluster giants are also discussed, and it is suggested that while both triple-alpha and CNO mixing may be necessary to explain some CN-strong stars, one would expect CN variations in the metal-rich clusters from CNO mixing alone. The range in CN strength observed by Hesser et al. (1977) in these clusters could thus be analogous to the range in G-band strength in the metal-poor clusters such as M92.
McClure Robert D.
Norris Jackson
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