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Detecting AGB stars in LG Dwarf Galaxies for Understanding Galaxy Formation and Evolution

Published online by Cambridge University Press:  29 August 2019

E. Saremi ,
A. Javadi ,
J. van Loon ,
H. Khosroshahi  and
M. Torki
E. Saremi
Affiliation:
University of Birjand, Birjand, Iran email: [email protected] Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
A. Javadi
Affiliation:
Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
J. van Loon
Affiliation:
Keele University, Keele, UK
H. Khosroshahi
Affiliation:
Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
M. Torki
Affiliation:
Institute for Research in Fundamental Sciences (IPM), Tehran, Iran Faculty of Science, University of Zanjan, Zanjan, Iran
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Abstract

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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.

Keywords

Stars: evolutionstars: AGBstars: variables: LPVstars: mass lossGalaxy: stellar content(galaxies:) Local Groupgalaxies: dwarf
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S339: Southern Horizons in Time-Domain Astronomy , November 2017 , pp. 336 - 339
Copyright
© International Astronomical Union 2019 

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