The Y2 isochrones getting an extra dimension

Sukyoung K. Yi, Yong Cheol Kim, Pierre Demarque, Young Wook Lee, Sang Il Han, Do Gyun Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)


The Yonsei-Yale Isochrones have been widely used since its birth in 2001. We announce a major upgrade mainly making varieties of helium values available. The recent works on the globular clusters with extreme helium abundances have called for such a need. The new version of the Y2 Isochrones are available for [α/Fe] = 0 through 0.6, δY/δZ = 1.5 through 3.0, and extreme helium abundances (Y = normal 0.05, 0.1, 0.15, 0.2), and for 11 metallicity grids, with full capability of interpolation. The database will be powerful for making population models. Besides, the accuracy of the models on the lower main sequence has been substantially improved. We illustrate the major upgrades and demonstrate the power of the new grids.

Original languageEnglish
Pages (from-to)413-416
Number of pages4
JournalProceedings of the International Astronomical Union
Issue numberS252
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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