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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 

References

Burstein, D., Faber, S. M., Gaskell, C. M., & Krumm, N. 1984, ApJ, 287, 586 CrossRefGoogle Scholar
Chaboyer, B., Demarque, P., Kernan, P. J., & Krauss, L. M. 1998, ApJ, 494, 96 Google Scholar
Cohen, J. G., Blakeslee, J. P., & Ryzhov, A. 1998, ApJ, 496, 808 CrossRefGoogle Scholar
Demarque, P., Chaboyer, B., Guenther, D., Pinsonneault, M., & Yi, S. 1996, Yale Isochrone 1996 Google Scholar
Jorgensen, I. 1997, MNRAS, 288, 161 CrossRefGoogle Scholar
Kissler-Patig, M., Brodie, J. P., Schroder, L. L., Forbes, D. A., Grillmair, C. J., & Huchra, J. P. 1998, AJ, 115, 105 Google Scholar
Lee, H.-c., Yoon, S.-J., & Lee, Y.-W. 2000, AJ, 120, 998 CrossRefGoogle Scholar
Lee, Y.-W. 1992, PASP, 104, 798 Google Scholar
Lejeune, T., Cuisinier, F., & Buser, R. 1998, A&AS, 130, 65 Google Scholar
Mould, J. R., Oke, J. B., de Zeeuw, P. T., & Nemec, J. M. 1990, AJ, 99, 1823 Google Scholar
Oke, J. B., de Zeeuw, P. T., & Nemec, J. M. 1995, PASP, 99, 1823 Google Scholar
Park, J.-H., & Lee, Y.-W. 1997, ApJ, 476, 28 CrossRefGoogle Scholar
Salaris, M., Chieffi, A., & Straniero, O. 1993, ApJ, 414, 580 CrossRefGoogle Scholar
Salpeter, E. E. 1955 ApJ, 121, 161 CrossRefGoogle Scholar
Worthey, G. 1994, ApJS, 95, 107 Google Scholar
Yi, S., Demarque, P., & Kim, Y.-C. 1997, ApJ, 482, 677 CrossRefGoogle Scholar
Yi, S., Lee, Y.-W., Woo, J.-H., Park, J.-H., Demarque, P., & Oemler, A. Jr. 1999, ApJ, 513, 128 Google Scholar