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• W2276444800 abstract "We present a new set of isochrones in which the effect of the alpha-element enhancement is fully incorporated. These isochrones are an extension of the already published set of YY Isochrones (Yi et al. 2001: Paper 1), constructed for the scaled-solar mixture. As in Paper 1, helium diffusion and convective core overshoot have been taken into account.The range of chemical compositions covered is 0.00001 < Z < 0.08. The models were evolved from the pre-main-sequence stellar birthline to the onset of helium burning in the core. The age range of the full isochrone set is 0.1 -- 20 Gyr, while younger isochrones of age 1 -- 80 Myr are also presented up to the main-sequence turn-off. Combining this set with that of Paper 1 for scaled-solar mixture isochrones, we provide a consistent set of isochrones which can be used to investigate populations of any value of alpha-enhancement. We confirm the earlier results of Paper 1 that inclusion of alpha-enhancement effects further reduces the age estimates of globular clusters by approximately 8 percent if [alpha/Fe]=+0.3. It is important to note the metallicity dependence of the change in age estimates (larger age reductions in lower metallicities). This reduces the age gap between the oldest metal-rich and metal-poor Galactic stellar populations and between the halo and the disk populations. The isochrone tables, together with interpolation routines have been made available via internet; http://www.astro.yale.edu/demarque/yyiso.html http://www-astro.physics.ox.ac.uk/~yi/yyiso.html http://csaweb.yonsei.ac.kr/~kim/yyiso.html" @default.
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• W2276444800 date "2002-12-01" @default.
• W2276444800 modified "2023-10-03" @default.
• W2276444800 title "The <i>Y</i> ² Isochrones for α‐Element Enhanced Mixtures" @default.
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• W2276444800 doi "https://doi.org/10.1086/343041" @default.
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