No Heavy-Element Dispersion in the Globular Cluster M92

Creators: Cohen, Judith G.

Style

An error occurred while generating the citation.

Abstract

Although there have been recent claims that there is a large dispersion in the abundances of the heavy neutron capture elements in the old Galactic globular cluster M92, we show that the measured dispersion for the absolute abundances of four of the rare earth elements within a sample of 12 luminous red giants in M92 (≤0.07 dex) does not exceed the relevant sources of uncertainty. As expected from previous studies, the heavy elements show the signature of the r-process. Their abundance ratios are essentially identical to those of M30, another nearby globular cluster of similar metallicity.

Additional Information

© 2011 The American Astronomical Society. Received 2011 July 9; accepted 2011 September 12; published 2011 September 27. Based in part on observations obtained at the W.M. Keck Observatory, which is operated jointly by the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. We are grateful to the many people who have worked to make the Keck Telescope and its instruments a reality and to operate and maintain the Keck Observatory. The author wishes to extend special thanks to those of Hawaiian ancestry on whose sacred mountain we are privileged to be guests. Without their generous hospitality, none of the observations presented herein would have been possible. The author thanks NSF Grant AST-0908139 for partial support.

Attached Files

Published - Cohen2011p16405Astrophys_J_Lett.pdf

Accepted Version - 1109.2876.pdf

Files

1109.2876.pdf

Files (378.0 kB)

Name	Size	Download all
1109.2876.pdf md5:e2945b73e7f7470f66194ddffd1e363a	163.7 kB	Preview Download
Cohen2011p16405Astrophys_J_Lett.pdf md5:edf9aee03ed345c2af8690295ea26f4c	214.2 kB	Preview Download

Additional details

	All versions	This version
Views	23	23
Downloads	16	16
Data volume	3.1 MB	3.1 MB