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Relative Ages from Horizontal-Branch Morphology: Revisited

Published online by Cambridge University Press:  03 August 2017

Young-Wook Lee ,
Hyun-chul Lee ,
Suk-Jin Yoon ,
Soo-Chang Rey  and
Brian Chaboyer
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

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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
Information
Symposium - International Astronomical Union , Volume 207: Extragalactic Star Clusters , 2002 , pp. 110 - 112
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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