Photometry of Resolved Stellar Populations in Local Group Galaxies

Daniel Faria

Research output: ThesisDoctoral Thesis (compilation)


This thesis presents results from two projects using photometric

observations to investigate stellar populations in Local Group


In the first project, Strömgren photometry is used to study stellar

populations in dwarf spheroidal galaxies. It is demonstrated that the

Strömgren c1 and m1 colour indices can be efficiently used to

identify RGB members in dwarf spheroidal galaxies, and derive

accurate, age-independent, metallicities for individual stars. The

method is applied on the Draco dwarf spheroidal galaxy. The metallicity

distribution function is presented and spatial metallicity gradients are


In the second project, deep HST/ACS observations are used to

investigate the nature of several substructures in the outer regions

of M31. The individual colour-magnitude diagrams for five

substructures are presented and compared. A detailed investigation of

one of the substructures, the G1 clump, is performed and stellar ages and

metallicities are derived. Possible scenarios for the origin of the G1

clump are discussed based on these results.
Original languageEnglish
Awarding Institution
  • Lund Observatory
  • Feltzing, Sofia, Supervisor
Award date2006 Sep 15
Print ISBNs978-91-628-6905-2
Publication statusPublished - 2006

Bibliographical note

Defence details

Date: 2006-09-15
Time: 10:15
Place: Lundmark lecture hall (Lundmarksalen), Lund Observatory, Sölvegatan 27, Lund

External reviewer(s)

Name: Gallagher III, John S.
Title: Professor
Affiliation: University of Wisconsin-Madison, USA


Subject classification (UKÄ)

  • Astronomy, Astrophysics and Cosmology


  • Astronomi
  • Astronomy
  • Local Group
  • Galaxy: halo
  • Galaxies: dwarf
  • Galaxy: stellar content
  • Galaxies: photometry
  • Techniques: photometric
  • Stars: fundamental parameters


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