The ellipticities of globular clusters and the second parameter problem

Details The ellipticities of globular clusters and the second parameter problem The ellipticities of globular clusters and the second parameter problem

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..245n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 1, 1983, p. 245-248.

Astronomy and Astrophysics

Astrophysics

25

Abundance, Globular Clusters, Horizontal Branch Stars, Stellar Rotation, Angular Momentum, Ellipticity, Star Distribution, Stellar Evolution

Scientific paper

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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