On ageing star clusters using red supergiants independent of the fraction of interacting binary stars

Author:

Eldridge J J1ORCID,Beasor Emma R23,Britavskiy N45

Affiliation:

1. Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand

2. NSF National Optical-Infrared Astronomy Research Laboratory, 950 N. Cherry Ave., Tucson, AZ 85719, USA

3. Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, UK

4. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain

5. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain

Abstract

ABSTRACT We use the Binary Population and Spectral Synthesis models to test the recent suggestion that red supergiants can provide an accurate age estimate of a coeval stellar population that is unaffected by interacting binary stars. Ages are estimated by using both the minimum luminosity of red supergiants and the mean luminosity of red supergiants in a cluster. We test these methods on a number of observed star clusters and find our results in agreement with previous estimates. Importantly, we find the difference between the ages derived from stellar population models with and without a realistic population of interacting binary stars is only a few hundred thousand years at most. We find that the mean luminosity of red supergiants in a cluster is the best method to determine the age of a cluster because it is based on the entire red supergiant population rather than using only the least luminous red supergiant.

Funder

National Aeronautics and Space Administration

Space Telescope Science Institute

Ministerio de Ciencia, Innovación y Universidades

ACIISI

European Regional Development Fund

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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