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Title: THE PECULIAR CHEMICAL INVENTORY OF NGC 2419: AN EXTREME OUTER HALO 'GLOBULAR CLUSTER'

Abstract

NGC 2419 is a massive outer halo Galactic globular cluster (GC) whose stars have previously been shown to have somewhat peculiar abundance patterns. We have observed seven luminous giants that are members of NGC 2419 with Keck/HIRES at reasonable signal-to-noise ratio. One of these giants is very peculiar, with an extremely low [Mg/Fe] and high [K/Fe] but normal abundances of most other elements. The abundance pattern does not match the nucleosynthetic yields of any supernova model. The other six stars show abundance ratios typical of inner halo Galactic GCs, represented here by a sample of giants in the nearby GC M30. Although our measurements show that NGC 2419 is unusual in some respects, its bulk properties do not provide compelling evidence for a difference between inner and outer halo GCs.

Authors:
;  [1];  [2]
  1. Palomar Observatory, Mail Stop 249-17, California Institute of Technology, Pasadena, CA 91125 (United States)
  2. Brion Technologies Inc., 4211 Burton Drive, Santa Clara, CA 95054 (United States)
Publication Date:
OSTI Identifier:
21587389
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 740; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/740/2/60; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; GALAXIES; STAR CLUSTERS; STARS

Citation Formats

Cohen, Judith G., Kirby, Evan N., and Huang Wenjin, E-mail: jlc@astro.caltech.edu, E-mail: enk@astro.caltech.edu, E-mail: wenjin.huang@brion.com. THE PECULIAR CHEMICAL INVENTORY OF NGC 2419: AN EXTREME OUTER HALO 'GLOBULAR CLUSTER'. United States: N. p., 2011. Web. doi:10.1088/0004-637X/740/2/60; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Cohen, Judith G., Kirby, Evan N., & Huang Wenjin, E-mail: jlc@astro.caltech.edu, E-mail: enk@astro.caltech.edu, E-mail: wenjin.huang@brion.com. THE PECULIAR CHEMICAL INVENTORY OF NGC 2419: AN EXTREME OUTER HALO 'GLOBULAR CLUSTER'. United States. doi:10.1088/0004-637X/740/2/60; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Cohen, Judith G., Kirby, Evan N., and Huang Wenjin, E-mail: jlc@astro.caltech.edu, E-mail: enk@astro.caltech.edu, E-mail: wenjin.huang@brion.com. Thu . "THE PECULIAR CHEMICAL INVENTORY OF NGC 2419: AN EXTREME OUTER HALO 'GLOBULAR CLUSTER'". United States. doi:10.1088/0004-637X/740/2/60; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21587389,
title = {THE PECULIAR CHEMICAL INVENTORY OF NGC 2419: AN EXTREME OUTER HALO 'GLOBULAR CLUSTER'},
author = {Cohen, Judith G. and Kirby, Evan N. and Huang Wenjin, E-mail: jlc@astro.caltech.edu, E-mail: enk@astro.caltech.edu, E-mail: wenjin.huang@brion.com},
abstractNote = {NGC 2419 is a massive outer halo Galactic globular cluster (GC) whose stars have previously been shown to have somewhat peculiar abundance patterns. We have observed seven luminous giants that are members of NGC 2419 with Keck/HIRES at reasonable signal-to-noise ratio. One of these giants is very peculiar, with an extremely low [Mg/Fe] and high [K/Fe] but normal abundances of most other elements. The abundance pattern does not match the nucleosynthetic yields of any supernova model. The other six stars show abundance ratios typical of inner halo Galactic GCs, represented here by a sample of giants in the nearby GC M30. Although our measurements show that NGC 2419 is unusual in some respects, its bulk properties do not provide compelling evidence for a difference between inner and outer halo GCs.},
doi = {10.1088/0004-637X/740/2/60; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
journal = {Astrophysical Journal},
number = 2,
volume = 740,
place = {United States},
year = {Thu Oct 20 00:00:00 EDT 2011},
month = {Thu Oct 20 00:00:00 EDT 2011}
}