Journal
ASTROPHYSICAL JOURNAL
Volume 725, Issue 1, Pages 288-295Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/725/1/288
Keywords
Galaxy: formation; Galaxy: halo; globular clusters: individual (NGC 2419)
Categories
Funding
- NSF [AST-0908139, AST-0071048]
- NASA [HST-HF-01233.01, NAS 5-26555]
- Space Telescope Science institute
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0908139] Funding Source: National Science Foundation
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We isolate a sample of 43 upper red giant branch stars in the extreme outer halo Galactic globular cluster (GC) NGC 2419 from two Keck/DEIMOS slitmasks. The probability that there is more than one contaminating halo field star in this sample is extremely low. Analysis of moderate-resolution spectra of these cluster members, as well as of our Keck/HIRES high-resolution spectra of a subsample of them, demonstrates that there is a small but real spread in Ca abundance of similar to 0.2 dex within this massive metal-poor GC. This provides additional support to earlier suggestions that NGC 2419 is the remnant of a dwarf galaxy accreted long ago by the Milky Way.
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