Evidence from stellar abundances for a large age difference between two globular clusters

Details Evidence from stellar abundances for a large age difference between two globular clusters Evidence from stellar abundances for a large age difference between two globular clusters

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.351..212d&link_type=abstract

Nature (ISSN 0028-0836), vol. 351, May 16, 1991, p. 212-214. NSF-supported research.

Computer Science

74

Abundance, Galactic Evolution, Globular Clusters, Milky Way Galaxy, Stellar Composition, Carbon, Nitrogen, Oxygen, Red Giant Stars, Stellar Models

Scientific paper

Claims of an apparent 2 Gyr age differences between globular clusters associated with the Galaxy conflict with standard models for the formation of the Galaxy, according to which the system of globular clusters formed during the dynamical collapse of the protogalactic cloud in a process which should have lasted no more than 1 Gyr. These age differences are derived from stellar evolution models using assumed CNO abundances. To eliminate the possibility that uncertainty in these abundances could account for the apparent age difference, abundances were measured in red giants in the globular clusters NGC288 and NGC362. It was found that the Fe abundance and the sum of the C, N, and O abundances are essentially the same in every star studied. By eliminating compositional differences and thus confirming the reality of the age difference, these results imply a cluster formation period that is hard to reconcile with the standard collapse model.

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