期刊
ASTRONOMICAL JOURNAL
卷 122, 期 3, 页码 1429-1437出版社
UNIV CHICAGO PRESS
DOI: 10.1086/322101
关键词
globular clusters : general; globular clusters : individual (M71); stars : abundances; stars : evolution
We present [Fe/H] abundance results that involve a sample of stars with a wide range in luminosity, from luminous giants to stars near the turnoff in a globular cluster. Our sample of 25 stars in M71 includes 10 giant stars more luminous than the RHB, three horizontal branch stars, nine giant stars less luminous than the RHB, and three stars near the turnoff. We analyzed both Fe I and Fe II 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 in T-eff and luminosity, suggesting that non-LTE effects are negligible in our iron abundance determination. In this globular cluster, there is no di+erence among the mean [Fe/H] of giant stars located at or above the RHB, RHB stars, giant stars located below the RHB and stars near the turnoff.
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