Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..538s&link_type=abstract
Astronomical Journal, vol. 86, Apr. 1981, p. 538-543.
Astronomy and Astrophysics
Astronomy
6
Abundance, Astronomical Spectroscopy, Calcium, Globular Clusters, Spectrum Analysis, Balmer Series, Centaurus Constellation, H Lines, K Lines, Lyra Constellation, Ubv Spectra, Variable Stars
Scientific paper
Integrated spectra have been used to search for a gradient in the abundance of calcium within the central 7 arcmin of the unusual globular cluster Omega Cen. The upper limit for the size of a calcium abundance gradient across this region is 0.2 dex. Previously published observations have been examined for evidence of abundance gradients at larger radial distances. While it is confirmed that there is evidence for such a gradient, this evidence is not yet compelling. Studies of four globular clusters provide no evidence that large abundance gradients exist within individual globular clusters.
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