# Recovering the Star Formation History of IC 1613 Dwarf Galaxy Using Evolved Stars

## TL;DR

This paper introduces a new method using evolved stars to reconstruct the star formation history of the dwarf galaxy IC 1613, confirming no major star formation episodes in the last 5 billion years.

## Contribution

The study presents a novel approach leveraging long period variable stars to determine the SFH of resolved galaxies, offering an alternative to traditional CMD-based methods.

## Key findings

- No significant star formation in IC 1613 over the past 5 Gyr
- Validated the evolved stars method as an effective SFH tracer
- Provided independent confirmation of the galaxy's star formation timeline

## 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 IC 1613, 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 IC 1613 over the past 5 Gyr.