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Chemical Evolution of Stellar Populations

Published online by Cambridge University Press:  07 August 2017

B.E.J. Pagel*
Affiliation:
NORDITA Blegdamsvej 17 DK-2100 Copenhagen ø Denmark

Abstract

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Stars can now mostly be separated into disk and halo members when both Galactic rotation velocity and metallicity are considered. New O/Fe data give results similar to α/Fe data and enable the O or α-element distribution function for the halo to be fitted to Hartwick's modification of the Simple Model up to nearly solar abundances, implying strong overlap with the disk and no sharp break in [O/Fe] when [Fe/H] ≃ −1. The G-dwarf problem and large-scale radial abundance gradients are discussed; in both cases, there are deficiencies in the data and too many alternative hypotheses capable of explaining them.

Type
I. The Stellar Populations in the Milky Way
Copyright
Copyright © Kluwer 

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