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IPM
30
YEARS OLD

“School of Astronomy”

Paper   IPM / Astronomy / 15817
   School of Astronomy
  Title: Detecting AGB stars in LG Dwarf Galaxies for Understanding Galaxy Formation and Evolution
  Author(s):
1 . E. Saremi
2 . A. Javadi
3 . J. van Loon
4 . H. Khosroshahi
5 . M. Torki
  Status: Published
  Journal: Cambridge University Press
  Vol.: 14
  Year: 2019
  Supported by:           ipm IPM
  Abstract:
Stars are the main ingredients of galaxies, and the sites of the creation of most chemical elements in our universe. The knowledge that we gain from studying nearby resolved stellar populations assists directly our ability to measure the properties of distant galaxies. The overall objective of this project is to study galaxy formation and evolution in a complete environment of the dwarf galaxies in the Local Group, by using the same methods for all of them. For that purpose, we used the INT to conduct a monitoring survey of the majority of Local-Group dwarf galaxies in order to identify the most evolved AGB stars that are long-period variables (LPV). LPV stars reach their maximum brightness amplitudes at optical wavelengths, owing to changes in temperature. They trace stellar populations as young as �?�30 Myr up to as old as �?�10 Gyr, and identifying them is one of the best ways of reconstructing star-formation history using a method that we have developed and applied successfully to other Local-Group galaxies. Since the luminosity variations span 100�??1000 days, we planned observations over 10 epochs, spaced �?�3 months apart; 9 epochs of data have so far been obtained.

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