Astrophysics and Space Science

, Volume 291, Issue 3–4, pp 261–262 | Cite as

The Y2 Isochrones

  • Sukyoung K. Yi
  • Pierre demarque
  • Yong-Cheol Kim


We present a new set of isochrones in which the effect of the α-element enhancement is fully incorporated. The isochrone tables, together with interpolation routines in age and chemical composition, and in [α/Fe] are available on request as well as from the electronic version of our ApJ papers. Newly derived ages of Galactic globular clusters using these isochrones are 20 to 30% smaller than previous estimates.

stellar evolution 


  1. Alexander, D.R. and Ferguson, J.W.: 1994, ApJ 437, 879.Google Scholar
  2. Bahcall, J.N. and Pinsonneault, M.H.: 1992, Rev. Mod. Phys. 60, 297.Google Scholar
  3. Grevesse, N. and Noels, A.: 1993, in: N. Prantzos, E. Vangioni-Flam, and M. Cassé (eds.), Origin and Evolution of the Elements, Cambridge University Press, Cambridge, p. 15.Google Scholar
  4. Iglesias, C.A. and Rogers, F.J.: 1996, ApJ 464, 943.Google Scholar
  5. Itoh, N., Adachi, T., Nagakawa, M., Kohyama, Y. and Munakata, H.: 1989, ApJ 339, 354; erratum, ApJ 360, 741.Google Scholar
  6. Kim, Y.-C., Demarque, P., Yi, S. and Alexander, D.: 2002,ApJS 143, 499.Google Scholar
  7. Rogers, F.J., Swenson, F.J. and Iglesias, C.A.: 1996,ApJ 456, 902.Google Scholar
  8. Rogers, F.J. and Iglesias, C.A.: 1995, ASP Conf. Ser. 78, 78.Google Scholar
  9. Thoul, A.A., Bahcall, J.N. and Loeb, A.: 1994, ApJ 421, 828.Google Scholar
  10. VandenBerg, D.A., Swenson, F.J., Rogers, F.J., Iglesias, C.A. and Alexander, D.R.: 2000, ApJ 532, 430.Google Scholar
  11. Yi, S., Demarque, P., Kim, Y.-C., Lee, Y.-W., Ree, C.H., Lejeune, T. and Barnes, S.: 2001, ApJS 136, 417.Google Scholar
  12. Yi, S., Kim, Y.-C. and Demarque, P.: 2003, ApJS 144, 259.Google Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Sukyoung K. Yi
    • 1
  • Pierre demarque
    • 2
  • Yong-Cheol Kim
    • 3
  1. 1.University of OxfordOxfordUK
  2. 2.Department of AstronomyYale UniversityNew HavenU.S.A
  3. 3.Department of AstronomyYonsei UniversitySeoulKorea

Personalised recommendations