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Title:
The ellipticities of globular clusters and the second parameter problem
Authors:
Norris, J.
Affiliation:
AA(Mount Stromlo and Siding Spring Observatoires, Canberra, Australia)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 1, 1983, p. 245-248. (ApJ Homepage)
Publication Date:
09/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Globular Clusters, Horizontal Branch Stars, Stellar Rotation, Angular Momentum, Ellipticity, Star Distribution, Stellar Evolution
DOI:
10.1086/161286
Bibliographic Code:
1983ApJ...272..245N

Abstract

For globular clusters with abundances in the range -1.9 <= [Fe/H] <= -1.4, which brackets those of the classic "second parameter" trio M13-M3-NGC 7006, a correlation appears to exist between the Mironov horizontal branch parameter B/(B+R) and the apparent cluster ellipticities, in the sense that there are no clusters with red horizontal branches and higher than average ellipticities. The correlation is significant at the 4.0% level, and offers support for the hypothesis that angular momentum is a parameter affecting horizontal-branch morphology.

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