Chemical Abundances in Globular Clusters from Keck/HIRES Observations

Details Chemical Abundances in Globular Clusters from Keck/HIRES Observations Chemical Abundances in Globular Clusters from Keck/HIRES Observations

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.4014b&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #40.14; Bulletin of the American Astronomical Society, Vol. 32, p.1282

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Scientific paper

Spectroscopic observations at high spectral resolution of unevolved stars in globular clusters have only been possible since the 1993 advent of the Keck-I 10-meter telescope and its high-resolution spectrometer. Our program of deriving chemical abundances of lithium and several other elements in some unevolved, but identical, stars in three globular clusters are described. For M 13 we have found a spread in Li abundances of a factor of five in four very similar stars. For six stars in M 92 the range is a factor of three. The stars with the highest abundances of Li show values that are a factor of two above the field halo star Li plateau. The abundances of several other species - Na, Mg, Si, Ca, Ti, Cr, Ni, Fe, Y, and Ba - show no such star-to-star variations. These abundances are compared with those of halo field stars which were derived from Keck HIRES spectra.

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