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Chemical Compositions of Southern Globular Clusters: 47 Tucanae, NGC3201, and NGC6752

Published online by Cambridge University Press:  14 August 2015

Catherine A. Pilachowski ,
Christopher Sneden  and
R. Canterna
Catherine A. Pilachowski
Affiliation:
University of Washington
Christopher Sneden
Affiliation:
University of Washington
R. Canterna
Affiliation:
University of Wyoming

Extract

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The metallicities of the globular clusters 47 Tucanae, NGC3201, and NGC6752 have been determined from high dispersion spectra obtained with the echelle spectrograph at CTIO. The mean iron deficiencies of NGC3201 and NGC6752 are −1.0 and −1.3, respectively. Oxygen is enriched by a factor of two in NGC3201; no oxygen data are available in NGC6752 due to the small radial velocity of this cluster. The atmospheric parameters and the abundances, relative to the Sun, of individual elements for two stars in 47 Tuc are tabulated below. Star identifications are taken from Hesser and Hartwick (1977). The stellar effective temperatures were established from the spectroscopic data; the data do not permit temperatures much in excess of those quoted. Surface gravities were calculated from the cluster's distance modulus and other reasonably well-known quantities, with the assumption that the mass of a cluster giant is 0.8 M⊙.

Type
August 30 Globular Clusters
Information
Symposium - International Astronomical Union , Volume 85: Star Clusters , 1980 , pp. 467 - 470
Copyright
Copyright © Reidel 1980 

References

Hesser, J.E. and Hartwick, F.D.A.: 1977, Astrophys. J. Suppl. 33, 361.Google Scholar