Neutron-Capture Element Abundances in the Globular Cluster M15

Details Neutron-Capture Element Abundances in the Globular Cluster M15 Neutron-Capture Element Abundances in the Globular Cluster M15

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...536l..85s&link_type=abstract

The Astrophysical Journal, Volume 536, Issue 2, pp. L85-L88.

Astronomy and Astrophysics

Astronomy

65

Galaxy: Globular Clusters: Individual: Messier Number: M15, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Abundances, Stars: Late-Type, Stars: Population Ii

Scientific paper

High-resolution, high signal-to-noise ratio, blue-violet spectra of three red giant branch tip stars in M15 have been obtained with the Keck I High-Resolution Echelle Spectrograph. These spectra have been analyzed to determine the abundances of several neutron-capture elements, including the radioactive chronometer element thorium. There are two principal results of this study. First, the abundances of the heavier (Z>=56) elements for each of the three stars is well matched by a scaled solar system r-process abundance distribution. Second, a weighted mean-observed Th/Eu ratio for the stars implies an age for the neutron-capture material in M15 stars of 14+/-3 Gyr, in reasonable agreement with other recent age estimates for Galactic globular clusters. Based on observations obtained with the Keck I Telescope of the W. M. Keck Observatory, which is operated by the California Association for Research in Astronomy (CARA), Inc., on behalf of the University of California, the California Institute of Technology, and NASA.

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