Two views of globular cluster stars in the Galactic halo

Details Two views of globular cluster stars in the Galactic halo Two views of globular cluster stars in the Galactic halo

2011-10-21

arxiv.org/abs/1110.4681v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

2 pages plus 1 figure, to appear in the proceedings of "Assembling the Puzzle of the Milky Way", Le Grand Bornand (Apr. 17-22,

Scientific paper

In Martell & Grebel (2010) we reported the discovery in the Sloan Digital Sky Survey-II/SEGUE spectroscopic database of a small subset of halo red giants, 2.5%, with CN and CH band strengths indicative of globular-cluster-like carbon and nitrogen abundances. Because the formation of stars with unusual light-element abundances is thought to be restricted to high-density environments like globular clusters, this result has strong implications for both cluster formation processes and the assembly history of the Galactic halo. Here we discuss two efforts to expand upon that work.

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