Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 479, Issue 1, Pages 75-93Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1353
Keywords
methods: numerical; binaries: general; galaxies: stellar content; globular clusters: general
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Funding
- Physics Department of the University of Auckland
- University of Auckland
- National Aeronautics and Space Administration
- National Science Foundation
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- Spanish MINECO [AyA2014-55216]
- NASA's Astrophysics Data System Bibliographic Services
- NeSI's collaborator institutions
- Ministry of Business, Innovation & Employment's Research Infrastructure programme
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Determining the properties of old stellar populations (those with age >1 Gyr) has long involved the comparison of their integrated light, either in the form of photometry or spectroscopic indexes, with empirical or synthetic templates. Here we re-evaluate the properties of old stellar populations using a new set of stellar population synthesis models, designed to incorporate the effects of binary stellar evolution pathways as a function of stellar mass and age. We find that single-aged stellar population models incorporating binary stars, as well as new stellar evolution and atmosphere models, can reproduce the colours and spectral indices observed in both globular clusters and quiescent galaxies. The best-fitting model populations are often younger than those derived from older spectral synthesis models and may also lie at slightly higher metallicities.
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