AGB population as probes of galaxy structure and evolution

Abstract

The evolution of galaxies is driven by the birth and death of stars. AGB stars are at the end points of their evolution and therefore their luminosities directly reflect their birth mass; this enables us to reconstruct the star formation history. These cool stars also produce dust grains that play an important role in the temperature regulation of the interstellar medium (ISM), chemistry, and the formation of planets. These stars can be resolved in all of the nearby galaxies. Therefore, the Local Group of galaxies offers us a superb near-field cosmology site. Here we can reconstruct the formation histories, and probe the structure and dynamics, of spiral galaxies, of the many dwarf satellite galaxies surrounding the Milky Way and Andromeda, and of isolated dwarf galaxies. It also offers a variety of environments in which to study the detailed processes of galaxy evolution through studying the mass-loss mechanism and dust production by cool evolved stars. In this paper, I will first review our recent efforts to identify mass-losing Asymptotic Giant Branch (AGB) stars and red supergiants (RSGs) in Local Group galaxies and to correlate spatial distributions of the AGB stars of different mass with galactic structures. Then, I will outline our methodology to reconstruct the star formation histories using variable pulsating AGB stars and RSGs and present the results for rates of mass-loss and dust production by pulsating AGB stars and their analysis in terms of stellar evolution and galaxy evolution.

Invited contribution for "IAU Symposium 343: Why Galaxies Care About AGB Stars:A Continuing Challenge through Cosmic Time", to be published in the "IAU Proceedings Series", (eds.) Franz Kerschbaum, Martin Groenewegen and Hans Olofsson

References in corpus (10)

• The Star Formation Histories of Local Group Dwarf Galaxies III. Characterizing Quenching in Low-Mass Galaxies
• An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS), II. Discovery of Metal-poor Dusty AGB Stars
• An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS), I. Overview
• The UK Infrared Telescope M33 monitoring project. V. The star formation history across the galactic disc
• Pulsation-triggered mass loss from AGB stars: the 60-day critical period
• Long period variable stars in NGC 147 and NGC 185. I. Their star formation histories
• Near-infrared Mira Period-Luminosity Relations in M33
• The UK Infrared Telescope M33 monitoring project. IV. Variable red giant stars across the galactic disc
• A Remarkable Oxygen-rich Asymptotic Giant Branch Variable in the Sagittarius Dwarf Irregular Galaxy
• The Identification of Extreme Asymptotic Giant Branch Stars and Red Supergiants in M33 by 24 μm Variability

Cited by in corpus (2)

• Interrelations between Astrochemistry and Galactic Dynamics
• Machine Learning Classification of Young Stellar Objects and Evolved Stars in the Magellanic Clouds Using the Probabilistic Random Forest Classifier