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Bright-red stars in the dwarf irregular galaxy Leo A

Published online by Cambridge University Press:  30 October 2019

Alina Leščinskaitė ,
Rima Stonkutė  and
Vladas Vansevičius
Alina Leščinskaitė
Affiliation:
Center for Physical Sciences and Technology, Saulėtekis av. 3, 10257 Vilnius, Lithuania, email: alina.lescinskaite@ftmc.lt
Rima Stonkutė
Affiliation:
Center for Physical Sciences and Technology, Saulėtekis av. 3, 10257 Vilnius, Lithuania, email: alina.lescinskaite@ftmc.lt Astronomical Observatory of Vilnius University, M. K. Čiurlionis st. 29, 03100 Vilnius, Lithuania, email: vladas.vansevicius@ff.vu.lt
Vladas Vansevičius
Affiliation:
Center for Physical Sciences and Technology, Saulėtekis av. 3, 10257 Vilnius, Lithuania, email: alina.lescinskaite@ftmc.lt Astronomical Observatory of Vilnius University, M. K. Čiurlionis st. 29, 03100 Vilnius, Lithuania, email: vladas.vansevicius@ff.vu.lt
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Abstract

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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,Hα) 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 ± 0′.04 and 1′53 ± 0′.03, respectively. Also, we determined the S-L of BR stars of 0′.85 ± 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.

Keywords

galaxies: dwarfgalaxies: individual (Leo A)galaxies: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 99 - 102
Copyright
© International Astronomical Union 2019 

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