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S. V. Ramirez, J. G. Cohen (Caltech), J. Buss, M. M. Briley (U. Wisconsin at Oshkosh)
We present abundance results that for the first time involve a sample of stars with a wide range in luminosity from luminous giants to main sequence stars near the turnoff in a globular cluster. Our sample of 25 stars in M71 includes 10 giant stars more luminous than the RHB, 3 horizontal branch stars, 9 giant stars less luminous than the RHB, and 3 main sequence stars near the turnoff. We analyzed absorption lines in high dispersion spectra observed with HIRES at the W. M. Keck Observatory. We find that the [Fe/H] abundances from both Fe I and Fe II lines agree with each other and with earlier determinations. Also the [Fe/H] obtained from Fe I and Fe II lines is constant within the rather small uncertainties for this group of stars over the full range they span in effective temperature and luminosity. The analysis of lines of other elements, including sodium and oxygen, is currently underway. The results obtained will contribute to the better understanding of star-to-star abundance variations within stars of a globular cluster.