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“School of Astronomy”

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Paper   IPM / Astronomy / 16119
School of Astronomy
  Title:   Recovering the Star Formation History of IC1613 Dwarf Galaxy Using Evolved Stars
  Author(s): 
1.  Seyed Azim . Hashemi
2.  Atefeh . Javadi
3.  Jacco . Th. van Loon
  Status:   Published
  Journal: IAU
  Vol.:  14
  Year:  2019
  Supported by:            ipm IPM
  Abstract:
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

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