New Yonsei-Yale (Y2) Isochrones and horizontal-branch evolutionary tracks with helium enhancements

S. I. Han; Y. C. Kim; Y. W. Lee; S. K. Yi; D. G. Kim; P. Demarque

doi:10.1007/978-3-540-76961-3_9

New Yonsei-Yale (Y²) Isochrones and horizontal-branch evolutionary tracks with helium enhancements

S. I. Han, Y. C. Kim, Y. W. Lee, S. K. Yi, D. G. Kim, P. Demarque

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

6 Citations (Scopus)

Abstract

Recent studies [4,8,7,9,3] suggest that peculiar features observed in the horizontal-branch (HB) and main-squence (MS) of some Globular Clusters (GCs) are naturally reproduced by the presence of super-He-rich populations. However, there are no isochrones and self-consistent HB tracks available in the literature that are based on the up-to-date input physics and wide ranges of He and metal abundances. Here we present new sets of Y² isochrones and HB evolutionary tracks with the effects of He enhancements. The most up-to-date input physics are adopted, and the effects of α-enhancements ([α/Fe]=0.3) are also fully taken into account. These isochrones and tracks have been constructed for more realistic evolutionary population syntheses for old stellar populations, such as GCs and elliptical galaxies. The new isochrones and HB tracks well reproduce the observed color magnitude diagrams of Galactic GCs, including peculiar features observed in the HB and MS of ω Centauri and NGC 2808.

Original language	English
Title of host publication	Globular Clusters - Guides to Galaxies
Subtitle of host publication	Proceedings of the Joint ESO-FONDAP Workshop on Globular Clusters
Editors	Tom Richtler, Soren Larsen
Pages	33-34
Number of pages	2
DOIs	https://doi.org/10.1007/978-3-540-76961-3_9
Publication status	Published - 2009

Publication series

Name	ESO Astrophysics Symposia
Volume	2009
ISSN (Print)	1431-2433
ISSN (Electronic)	1611-6143

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Physics and Astronomy (miscellaneous)

Access to Document

10.1007/978-3-540-76961-3_9

Cite this

Han, S. I., Kim, Y. C., Lee, Y. W., Yi, S. K., Kim, D. G., & Demarque, P. (2009). New Yonsei-Yale (Y²) Isochrones and horizontal-branch evolutionary tracks with helium enhancements. In T. Richtler, & S. Larsen (Eds.), Globular Clusters - Guides to Galaxies: Proceedings of the Joint ESO-FONDAP Workshop on Globular Clusters (pp. 33-34). (ESO Astrophysics Symposia; Vol. 2009). https://doi.org/10.1007/978-3-540-76961-3_9

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abstract = "Recent studies [4,8,7,9,3] suggest that peculiar features observed in the horizontal-branch (HB) and main-squence (MS) of some Globular Clusters (GCs) are naturally reproduced by the presence of super-He-rich populations. However, there are no isochrones and self-consistent HB tracks available in the literature that are based on the up-to-date input physics and wide ranges of He and metal abundances. Here we present new sets of Y2 isochrones and HB evolutionary tracks with the effects of He enhancements. The most up-to-date input physics are adopted, and the effects of α-enhancements ([α/Fe]=0.3) are also fully taken into account. These isochrones and tracks have been constructed for more realistic evolutionary population syntheses for old stellar populations, such as GCs and elliptical galaxies. The new isochrones and HB tracks well reproduce the observed color magnitude diagrams of Galactic GCs, including peculiar features observed in the HB and MS of ω Centauri and NGC 2808.",

author = "Han, {S. I.} and Kim, {Y. C.} and Lee, {Y. W.} and Yi, {S. K.} and Kim, {D. G.} and P. Demarque",

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doi = "10.1007/978-3-540-76961-3_9",

language = "English",

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Han, SI, Kim, YC , Lee, YW , Yi, SK, Kim, DG & Demarque, P 2009, New Yonsei-Yale (Y²) Isochrones and horizontal-branch evolutionary tracks with helium enhancements. in T Richtler & S Larsen (eds), Globular Clusters - Guides to Galaxies: Proceedings of the Joint ESO-FONDAP Workshop on Globular Clusters. ESO Astrophysics Symposia, vol. 2009, pp. 33-34. https://doi.org/10.1007/978-3-540-76961-3_9

New Yonsei-Yale (Y²) Isochrones and horizontal-branch evolutionary tracks with helium enhancements. / Han, S. I.; Kim, Y. C.; Lee, Y. W. et al.

Globular Clusters - Guides to Galaxies: Proceedings of the Joint ESO-FONDAP Workshop on Globular Clusters. ed. / Tom Richtler; Soren Larsen. 2009. p. 33-34 (ESO Astrophysics Symposia; Vol. 2009).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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