Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103.1158s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, Nov. 1991, p. 1158-1175.
Astronomy and Astrophysics
Astronomy
27
Cyano Compounds, Globular Clusters, Magnesium Compounds, Red Giant Stars, Sodium Compounds, Absorption Spectra, Abundance, Color-Magnitude Diagram, Milky Way Galaxy
Scientific paper
Echelle spectra have been obtained of Mg I and Na I absorption lines in the wavelength range 5100-5600 A for small numbers of CN-strong and CN-weak red giants in the globular clusters NGC 6752, 47 Tuc, and M 22. In the case of the former two clusters, both of which exhibit bimodal CN band strength distributions, the CN-strong stars observed are generally found to exhibit enhanced Na lines but comparable Mg lines in comparison to CN-weak stars of similar (B-V) color and V magnitude. By contrast, a spectrum of a CN-rich giant in M 22 is found to show stronger lines of Na, Mg, Fe, Ti, and Sc than that of a CN-poor giant of comparable magnitude. It is suggested on the basis of available data that the nucleosynthesis products of He- and C-burning reactions were heterogeneously distributed within globular clusters at the time of their formation.
Smith Graeme H.
Wirth Gregory D.
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