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Relative Ages from Horizontal-Branch Morphology: Revisited

  • Young-Wook Lee (a1), Hyun-chul Lee (a1), Suk-Jin Yoon (a1), Soo-Chang Rey (a1) and Brian Chaboyer (a2)...

Abstract

We present our recent revision of model constructions for the horizontal-branch (HB) morphology of globular clusters, which suggests the HB morphology is more sensitive to age compared to our earlier models. We also present our high precision CCD photometry for the classic second parameter pair M3 and M13. The relative age dating based on this photometry indicates that M13 is indeed older than M3 by 1.7 Gyr. This is consistent with the age difference predicted from our new models, which provides a further support that the HB morphology is a reliable age indicator in most population II stellar systems.

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References

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Chaboyer, B., Demarque, P., Kernan, P. J., & Krauss, L. M. 1998, ApJ, 494, 96
Gratton, R. G., Fusi Pecci, F., Carretta, E., Clementini, G., Corsi, C. E. & Lattanzi, M. 1997, ApJ, 491, 749
Lee, Y.-W., & Yoon, S.-J. 2001, in preparation
Lee, Y.-W., Demarque, P., & Zinn, R. 1994, ApJ, 423, 248 (LDZ)
Lee, Y.-W., Yoon, S.-J., Lee, H.-c., & Woo, J.-H. 1999, in ASP Conf. Ser. Vol. 192, Spectrophotometric Dating of Stars and Galaxies, ed. Hubeny, I., Heap, S., & Cornett, (San Francisco: ASP), 185
Reid, I. N. 1998, AJ, 115, 204
Reimers, D. 1975, Mem. Soc. Roy. Sci. Liege, 6th Ser., 8, 369
Rey, S.-C., Yoon, S.-J., Lee, Y.-W., Chaboyer, B., & Sarajedini, A. 2001, AJ, 122, 321
VandenBerg, D. A., Bolte, M., & Stetson, P. B. 1990, AJ, 100, 445

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