Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5804s&link_type=abstract
American Astronomical Society, AAS Meeting #211, #58.04; Bulletin of the American Astronomical Society, Vol. 39, p.834
Other
Scientific paper
We use HST WFPC2 and ACS photometry of the massive globular cluster NGC 2419 to examine the evolved stellar populations. Recent evidence has pointed toward the chemical enrichment of a fraction of the stars in massive globular clusters by an earlier generation of stars. NGC 2419 has been previously shown (Harris et al. 1997; Ripepi et al. 2007) to have a substantial population of horizontal branch stars on its blue tail, making the HB population strongly bimodal. We characterize the HB star distribution down to the faint blue tail. We also examine the luminosity function to look for signs of a depletion of stars between the red giant bump and the tip of the giant branch that could indicate stars leaving the giant branch before undergoing a normal core helium flash. Such a depletion has been previously identified in NGC 2808 (Sandquist & Martel 2007), another massive cluster with a strongly bimodal horizontal branch with an extended blue tail.
The authors thank the National Science Foundation for support under grant AST 05-07785.
Hess Jennifer
Sandquist Eric L.
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