SIMBAD references

2011AJ....142...22R - Astron. J., 142, 22 (2011/July-0)

Heavy-element dispersion in the metal-poor globular cluster M92.


Abstract (from CDS):

Dispersion among the light elements is common in globular clusters (GCs), while dispersion among heavier elements is less common. We present detection of r-process dispersion relative to Fe in 19 red giants of the metal-poor GC M92. Using spectra obtained with the Hydra multi-object spectrograph on the WIYN Telescope at Kitt Peak National Observatory, we derive differential abundances for 21 species of 19 elements. The Fe-group elements, plus Y and Zr, are homogeneous at a level of 0.07-0.16 dex. The heavy-elements La, Eu, and Ho exhibit clear star-to-star dispersion spanning 0.5-0.8 dex. The abundances of these elements are correlated with one another, and we demonstrate that they were produced by r-process nucleosynthesis. This r-process dispersion is not correlated with the dispersion in C, N, or Na in M92, indicating that r-process inhomogeneities were present in the gas throughout star formation. The r-process dispersion is similar to that previously observed in the metal-poor GC M15, but its origin in M15 or M92 is unknown at present.

Abstract Copyright:

Journal keyword(s): globular clusters: individual: NGC 6341 - nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: Population II

VizieR on-line data: <Available at CDS (J/AJ/142/22): table2.dat table3.dat table6.dat abund.dat>

Simbad objects: 55

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