The Star Formation History of Sagittarius Dwarf Irregular Galaxy Derived from Long-period Variable Stars (The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. V.)
Tahere Parto (IPM, Alzahra University)
10 Jan 2023
Sagittarius dwarf irregular galaxy (SagDIG) is an isolated galaxy with low metallicity and high gas content in the Local Group. Like many dwarf irregular galaxies, SagDIG has had continuous star formation activity across its lifetime, though with different rates, and has experienced an enhancement of star formation since z ≃ 1. Its features make it an ideal target for many studies concerning the origin and evolution of dwarf galaxies. As a part of the Isaac Newton Telescope monitoring survey of LG dwarf galaxies, we studied this galaxy through its long-period variable stars (LPVs), namely, asymptotic giant branch stars (AGBs) and red supergiant stars. We employed (Javadi et al. 2011b) method, which relies on evaluating the relation between the luminosity and birth mass of LPVs to derive the star formation history (SFH) of SagDIG.
Our paper has been recently published and is available at https://iopscience.iop.org/article/10.3847/1538-4357/aca471 or https://arxiv.org/abs/2211.10695.
Resources: