Hostname: page-component-848d4c4894-nmvwc Total loading time: 0 Render date: 2024-06-13T18:14:40.456Z Has data issue: false hasContentIssue false

Relative Ages from Horizontal-Branch Morphology: Revisited

Published online by Cambridge University Press:  03 August 2017

Young-Wook Lee
Affiliation:
Center for Space Astrophysics & Department of Astronomy, Yonsei University, Shinchon 134, Seoul 120–749, Korea
Hyun-chul Lee
Affiliation:
Center for Space Astrophysics & Department of Astronomy, Yonsei University, Shinchon 134, Seoul 120–749, Korea
Suk-Jin Yoon
Affiliation:
Center for Space Astrophysics & Department of Astronomy, Yonsei University, Shinchon 134, Seoul 120–749, Korea
Soo-Chang Rey
Affiliation:
Center for Space Astrophysics & Department of Astronomy, Yonsei University, Shinchon 134, Seoul 120–749, Korea
Brian Chaboyer
Affiliation:
Department of Physics and Astronomy, 6127 Wilser Lab., Dartmouth College, Hanover, NH 03755-3528, USA

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Type
Part 1. The Star Clusters of Local Group Galaxies
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

Chaboyer, B., Demarque, P., Kernan, P. J., & Krauss, L. M. 1998, ApJ, 494, 96 Google Scholar
Gratton, R. G., Fusi Pecci, F., Carretta, E., Clementini, G., Corsi, C. E. & Lattanzi, M. 1997, ApJ, 491, 749 Google Scholar
Lee, Y.-W., & Yoon, S.-J. 2001, in preparation Google Scholar
Lee, Y.-W., Demarque, P., & Zinn, R. 1994, ApJ, 423, 248 (LDZ) Google Scholar
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 Google Scholar
Reid, I. N. 1998, AJ, 115, 204 Google Scholar
Reimers, D. 1975, Mem. Soc. Roy. Sci. Liege, 6th Ser., 8, 369 Google Scholar
Rey, S.-C., Yoon, S.-J., Lee, Y.-W., Chaboyer, B., & Sarajedini, A. 2001, AJ, 122, 321 Google Scholar
VandenBerg, D. A., Bolte, M., & Stetson, P. B. 1990, AJ, 100, 445 Google Scholar