The Y2 isochrones getting an extra dimension

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

doi:10.1017/S174392130802334X

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 journal › Article › peer-review

9 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	413-416
Number of pages	4
Journal	Proceedings of the International Astronomical Union
Volume	4
Issue number	S252
DOIs	https://doi.org/10.1017/S174392130802334X
Publication status	Published - 2008

Bibliographical note

Funding Information:
We thank Harvey Richer and Ivan King for sending us their new HST photometry data on NGC 6397. We are grateful to Chul Chung for regenerating the NGC2808 model HRD that suits the format of this paper. This research has been supported by Korea Research Foundation (SKY).

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1017/S174392130802334X

Cite this

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title = "The Y2 isochrones getting an extra dimension",

abstract = "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.",

author = "Yi, {Sukyoung K.} and Kim, {Yong Cheol} and Pierre Demarque and Lee, {Young Wook} and Han, {Sang Il} and Kim, {Do Gyun}",

note = "Funding Information: We thank Harvey Richer and Ivan King for sending us their new HST photometry data on NGC 6397. We are grateful to Chul Chung for regenerating the NGC2808 model HRD that suits the format of this paper. This research has been supported by Korea Research Foundation (SKY).",

year = "2008",

doi = "10.1017/S174392130802334X",

language = "English",

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journal = "Proceedings of the International Astronomical Union",

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publisher = "Cambridge University Press",

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T1 - The Y2 isochrones getting an extra dimension

AU - Yi, Sukyoung K.

AU - Kim, Yong Cheol

AU - Demarque, Pierre

AU - Lee, Young Wook

AU - Han, Sang Il

AU - Kim, Do Gyun

N1 - Funding Information: We thank Harvey Richer and Ivan King for sending us their new HST photometry data on NGC 6397. We are grateful to Chul Chung for regenerating the NGC2808 model HRD that suits the format of this paper. This research has been supported by Korea Research Foundation (SKY).

PY - 2008

Y1 - 2008

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AB - 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.

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