Population Models for Massive Globular Clusters

Young Wook Lee, Seok Joo Joo, Sang Il Han, Chongsam Na, Dongwook Lim, Dong Goo Roh

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Increasing number of massive globular clusters (GCs) in the Milky Way are now turned out to host multiple stellar populations having different heavy element abundances enriched by supernovae. Recent observations have further shown that [CNO/Fe] is also enhanced in metal-rich subpopulations in most of these GCs, including ω Cen and M22 (Marino et al. 2011, 2012). In order to reflect this in our population modeling, we have expanded the parameter space of Y2 isochrones and horizontal-branch (HB) evolutionary tracks to include the cases of normal and enhanced nitrogen abundances ([N/Fe] = 0.0, 0.8, and 1.6). The observed variations in the total CNO content were reproduced by interpolating these nitrogen enhanced stellar models. Our test simulations with varying N and O abundances show that, once the total CNO sum ([CNO/Fe]) is held constant, both N and O have almost identical effects on the HR diagram (see Fig. 1).

Original languageEnglish
Pages (from-to)247-248
Number of pages2
JournalProceedings of the International Astronomical Union
Issue numberH16
Publication statusPublished - 2012

Bibliographical note

Publisher Copyright:
© 2015 International Astronomical Union.

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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