http://arxiv.org/abs/1704.07382
The discovery of multiple stellar populations in the 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 spectro-photometric evolution of simple stellar populations (SSPs) with varying initial helium abundance ($Y_{ini}$). We show that $Y_{ini}$ 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 $Y_{ini}$. We discuss the implications and the prospects for the helium-enhanced populations in relation to the second generation populations found in the Milky Way GCs. All models are available at \url{this http URL}.
C. Chung, S. Yoon and Y. Lee
Wed, 26 Apr 17
56/60
Comments: Accepted for publication in ApJ, 20 pages, 12 figures, 3 tables