Bright-red stars in the dwarf irregular galaxy Leo A
| Autor: | R. Stonkutė, Alina Leščinskaitė, Vladas Vansevičius |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
education.field_of_study Milky Way Population FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Red-giant branch Photometry (optics) Stars Leo A Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Irregular galaxy education |
| DOI: | 10.48550/arxiv.1810.07471 |
| Popis: | We analysed a population of bright-red (BR) stars in the dwarf irregular galaxy Leo A by using multicolour photometry data obtained with the Subaru/Suprime-Cam ($B$, $V$, $R$, $I$, $H\alpha$) and HST/ACS ($F475W$ & $F814W$) instruments. In order to separate the Milky Way (MW) and Leo A populations of red stars, we developed a photometric method, which enabled us to study the spatial distribution of BR stars within the Leo A galaxy. We found a significant difference in the scale-length (S-L) of radial distributions of the "young" and "old" red giant branch (RGB) stars -- $0.'82 \pm 0.'04$ and $1.'53 \pm 0.'03$, respectively. Also, we determined the S-L of BR stars of $0.'85 \pm 0.'05$, which closely matches that of the "young" RGB stars. Additionally, we found a sequence of peculiar RGB stars and 8 dust-enshrouded stars in the Leo A galaxy. Comment: Accepted in proceedings of IAU Symposium 344 "Dwarf Galaxies: From the Deep Universe to the Present" |
| Databáze: | OpenAIRE |
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