Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-07-13
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Accepted for publication in the Astrophysical Journal. 5 figures, includes lengthly equivalent width tables which will only ap
Scientific paper
NGC 2419 is a massive outer halo Galactic globular cluster 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 SNR. 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 globular clusters, represented here by a sample of giants in the nearby globular cluster 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 globular clusters.
Cohen Judith
Huang Wenjin
Kirby Evan
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