Horizontal-Branch Morphology as an Age Indicator

Details Horizontal-Branch Morphology as an Age Indicator Horizontal-Branch Morphology as an Age Indicator

2001-04-25

arxiv.org/abs/astro-ph/0104405v1

Astrophys.Space Sci. 291 (2004) 223-230

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures, to appear in the Proceedings of the Conference "Astrophysical Ages and Timescales", ASP conference Series,

Scientific paper

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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