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Astrophysics > Astrophysics of Galaxies

arXiv:1805.08784 (astro-ph)
[Submitted on 22 May 2018]

Title:Reevaluating Old Stellar Populations

Authors:E R Stanway (Warwick, UK), J J Eldridge (Auckland, NZ)
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Abstract: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 reevaluate 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.
Comments: 20 pages. MNRAS (in press). Paper accompanies v2.2 release of the Binary Population and Spectral Synthesis (BPASS) models at this http URL or this http URL
Subjects: Astrophysics of Galaxies (astro-ph.GA); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:1805.08784 [astro-ph.GA]
  (or arXiv:1805.08784v1 [astro-ph.GA] for this version)
  https://doi.org/10.48550/arXiv.1805.08784
Related DOI: https://doi.org/10.1093/mnras/sty1353

Submission history

From: Elizabeth R. Stanway [view email]
[v1] Tue, 22 May 2018 18:00:01 UTC (7,759 KB)
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