Y2 (Yonsei-Yale) Stellar Models

  • Paper 1: Yi, Demarque, Kim, Lee, Ree, Lejeune, & Barnes 2001, ApJS, 136, 417
  • Paper 2: Kim, Demarque, Yi, & Alexander 2002, ApJS, 143, 499
  • Paper 3: Yi, Kim, & Demarque 2003, ApJS, 144, 259
  • Paper 4: Demarque, Woo, Kim, & Yi 2004, ApJS, 155, 667

    • We present a database of the latest stellar models of the $Y^2$ (Yonsei-Yale) collaboration. This database contains the stellar evolutionary tracks from the pre-main-sequence birthline to the helium core flash that were used to build Y2 Isochrones. We also provide a simple interpolation routine that generates stellar tracks for given sets of parameters (metallicity, mass, and alpha-enhancement).

    (20 October 2004)
    Note that the NEW tracks based on the new Overshoot scheme (Demarque et al. 2004) are now available. We now have a ramping treatment for the value of the convective core overshoot (that is, OS=0.0 for M<Mcrit, OS=0.05 for M=Mcrit, OS=0.1 for M=Mcrit+0.1, OS=0.15 for M=Mcrit+0.2, OS=0.2 for M>Mcrit+0.2), where Mcrit is the mass at and above which a star develops a convective core. This NEW version should be preferred to the OLD one. The interpolation routine works for both versions.

  • Download The NEW whole set of evolutionary tracks for [a/Fe]=0.0.
  • Download The NEW whole set of evolutionary tracks for [a/Fe]=+0.3.
  • Download The NEW whole set of evolutionary tracks for [a/Fe]=+0.6.
  • Download The OLD whole set of evolutionary tracks for [a/Fe]=0.0.
  • Download The OLD whole set of evolutionary tracks for [a/Fe]=+0.3.
  • Download The OLD whole set of evolutionary tracks for [a/Fe]=+0.6.
  • Download this updated version of the interpolation routine for the tracks (in mass, Z, [a/Fe]).

    • One should use this updated version rather than the one included together with the tracks.

    This is the US site of the Y2 Stellar Tracks.
    There also are an Asian site at Yonsei and a European site at Oxford.

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