YONSEI EVOLUTIONARY POPULATION SYNTHESIS (YEPS). II. SPECTRO-PHOTOMETRIC EVOLUTION OF HELIUM-ENHANCED STELLAR POPULATIONS

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Abstract

The discovery of multiple stellar populations in Milky Way globular clusters (GCs) has stimulated various follow-up studies on helium-enhanced stellar populations. Here we present the evolutionary population synthesis models for the spectro-photometric evolution of simple stellar populations (SSPs) with varying initial helium abundance (Yini). We show that Yini brings about dramatic changes in spectro-photometric properties of SSPs. Like the normal-helium SSPs, the integrated spectro-photometric evolution of helium-enhanced SSPs is also dependent on metallicity and age for a given Yini. We discuss the implications and prospects for the helium-enhanced populations in relation to the second-generation populations found in the Milky Way GCs. All of the models are available at http://web.yonsei.ac.kr/cosmic/data/YEPS.htm.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2017 Apr 24

All Science Journal Classification (ASJC) codes

  • General

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