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Abundances in globular cluster red giants. III - M71, M67, and NGC 2420

Cohen, Judith G. (1980) Abundances in globular cluster red giants. III - M71, M67, and NGC 2420. Astrophysical Journal, 241 . pp. 981-1000. ISSN 0004-637X. doi:10.1086/158412.

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High-dispersion spectra of four stars in the metal-rich globular cluster M71, four giants in the old open cluster M67, and two members of the metal-poor old open cluster NGC 2420 are analyzed with the aid of model atmospheres. The derived abundances are Fe/H = -1.27, -0.39, and -0.61 dex with regard to the sun for M71, M67, and NGC 2420, respectively. The pattern of elemental abundances is very similar over the full range from M92 to M67, with the most obvious differences being the strong overdepletion of copper, and perhaps scandium, with progressively lower metallicities. The metallicity derived for M71 is much lower than previous estimates, and the consequences of this for the abundance scale of globular clusters and the formation of the halo and disk of the Galaxy are discussed.

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Cohen, Judith G.0000-0002-8039-4673
Additional Information:© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received 1980 March 24; accepted 1980 April 24.
Subject Keywords:clusters: globular — stars: abundances — stars: late-type
Record Number:CaltechAUTHORS:20190531-091630742
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95970
Deposited By: George Porter
Deposited On:31 May 2019 23:03
Last Modified:16 Nov 2021 17:17

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