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 journalArticle

2 Citations (Scopus)

Abstract

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
Volume10
Issue numberH16
DOIs
Publication statusPublished - 2012 Jan 1

Fingerprint

globular clusters
population modeling
Hertzsprung-Russell diagram
nitrogen
stellar models
heavy elements
subpopulation
supernovae
diagram
metal
metals
simulation

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

Cite this

Lee, Young-Wook ; Joo, Seok Joo ; Han, Sang Il ; Na, Chongsam ; Lim, Dongwook ; Roh, Dong Goo. / Population Models for Massive Globular Clusters. In: Proceedings of the International Astronomical Union. 2012 ; Vol. 10, No. H16. pp. 247-248.
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Population Models for Massive Globular Clusters. / Lee, Young-Wook; Joo, Seok Joo; Han, Sang Il; Na, Chongsam; Lim, Dongwook; Roh, Dong Goo.

In: Proceedings of the International Astronomical Union, Vol. 10, No. H16, 01.01.2012, p. 247-248.

Research output: Contribution to journalArticle

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