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Recovering the Star Formation History of IC1613 Dwarf Galaxy Using Evolved Stars

Published online by Cambridge University Press:  30 October 2019

Seyed Azim Hashemi ,
Atefeh Javadi  and
Jacco Th. van Loon
Seyed Azim Hashemi
Affiliation:
Department of Physics, Sharif University of Technology, Tehran, 11155-9161, Iran email: [email protected] School of Astronomy, Institute for Research in Fundamental Sciences(IPM), Tehran, 19395-5531, Iran email: [email protected]
Atefeh Javadi
Affiliation:
School of Astronomy, Institute for Research in Fundamental Sciences(IPM), Tehran, 19395-5531, Iran email: [email protected]
Jacco Th. van Loon
Affiliation:
Lennard-Jones Laboratories, Keele University, ST5 5BG, UK email: [email protected]
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Abstract

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Determining the star formation history (SFH) is key to understand the formation and evolution of dwarf galaxies. Recovering the SFH in resolved galaxies is mostly based on deep colour–magnitude diagrams (CMDs), which trace the signatures of multiple evolutionary stages of their stellar populations. In distant and unresolved galaxies, the integrated light of the galaxy can be decomposed, albeit made difficult by an age–metallicity degeneracy. Another solution to determine the SFH of resolved galaxies is based on evolved stars; these luminous stars are the most accessible tracers of the underlying stellar populations and can trace the entire SFH. Here we present a novel method based on long period variable (LPV) evolved asymptotic giant branch (AGB) stars and red supergiants (RSGs). We applied this method to reconstruct the SFH for IC1613, an irregular dwarf galaxy at a distance of 750 kpc. Our results provide an independent confirmation that no major episode of star formation occurred in IC1613 over the past 5 Gyr.

Keywords

stars: variables: generalstars: AGB and post-AGBstars: supergiantsgalaxies: dwarfgalaxies: irregulargalaxies: individual: IC 1613
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 77 - 80
Copyright
© International Astronomical Union 2019 

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