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The Hβ Index As a Chronometer of Extragalactic Globular Cluster Systems

Published online by Cambridge University Press:  03 August 2017

Hyun-chul Lee ,
Suk-Jin Yoon  and
Young-Wook Lee
Hyun-chul Lee
Affiliation:
Center for Space Astrophysics and Department of Astronomy, Yonsei University, 134 Shinchon, Seoul 120-749, Korea
Suk-Jin Yoon
Affiliation:
Center for Space Astrophysics and Department of Astronomy, Yonsei University, 134 Shinchon, Seoul 120-749, Korea
Young-Wook Lee
Affiliation:
Center for Space Astrophysics and Department of Astronomy, Yonsei University, 134 Shinchon, Seoul 120-749, Korea

Abstract

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For the first time, we have taken into account the detailed systematic variation of horizontal-branch (HB) morphology with age and metallicity in our population synthesis models and they result that the integrated Hβ index is significantly affected by the presence of blue HB stars. As a matter of fact, due to the systematic HB morphology variation, it is found that Hβ does not monotonically decrease as metallicity increases at given ages, but shows a kind of wavy feature. According to our models, a systematic difference between the globular cluster system in the Milky Way Galaxy and that in NGC 1399 in the Hβ vs. Mg2 plane is explained if globular cluster systems in giant elliptical galaxies are a couple of billion years older, in the mean, than the Galactic counterpart.

Type
Part 4. Star Cluster Formation and Evolution: Theory and Observation
Information
Symposium - International Astronomical Union , Volume 207: Extragalactic Star Clusters , 2002 , pp. 721 - 723
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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