Abstract
This thesis presents results from two projects using photometric
observations to investigate stellar populations in Local Group
galaxies.
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
studied.
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.
observations to investigate stellar populations in Local Group
galaxies.
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
studied.
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 language | English |
|---|---|
| Qualification | Doctor |
| Awarding Institution | |
| Supervisors/Advisors |
|
| Award date | 2006 Sept 15 |
| Publisher | |
| ISBN (Print) | 978-91-628-6905-2 |
| Publication status | Published - 2006 |
Bibliographical note
Defence detailsDate: 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
Free keywords
- Astronomi
- Astronomy
- Local Group
- Galaxy: halo
- Galaxies: dwarf
- Galaxy: stellar content
- Galaxies: photometry
- Techniques: photometric
- Stars: fundamental parameters