| Title |
Stellar populations in the dwarf irregular galaxy Leo A / |
| Translation of Title |
Žvaigždžių populiacijos netaisyklingoje nykštukinėje galaktikoje Leo A. |
| Authors |
Leščinskaitė, Alina |
| DOI |
10.15388/vu.thesis.253 |
| Full Text |
|
| Pages |
140 |
| Keywords [eng] |
dissertation ; dwarf galaxies ; Leo A ; stellar populations |
| Abstract [eng] |
Dwarf galaxies are the most numerous type of galaxy in the Universe, thus they play a significant role in the study of galaxy formation and evolution. In this thesis we studied stellar populations in the dwarf irregular galaxy Leo A. A study of old stellar populations enabled us to discover luminous asymptotic giant branch stars and a group of peculiar red giant branch stars. We found that the blue red giant branch stars are concentrated in the central part of Leo A, while the red ones have a more extended distribution. These results support the outside-in star formation scenario in Leo A. While studying young stellar populations, we determined the age of core-helium-burning stars and their spatial distribution. We found that ~15% of young stars in Leo A are emission-line stars. We also determined that stellar feedback from young stellar populations created a prominent hole in the H I gas disk and formed an ionized front along the edge of the hole. |
| Dissertation Institution |
Valstybinis mokslinių tyrimų institutas Fizinių ir technologijos mokslų centras. |
| Type |
Doctoral thesis |
| Language |
English |
| Publication date |
2021 |
