Radial metallicity gradients of red giant stars in Local Group dwarf galaxies
Abstract
We performed a homogeneous analysis of spectroscopic literature data of red giant stars in 30 dwarf galaxies of the Local Group. We determined their radial metallicity profiles and calculated the associated gradients normalised for the half-light radius, ∇[Fe=H](R=Re). We compared these quantities with several parameters, finding no particular correlations or statistical di erences between the inspected dwarf subgroups. We also found that the presence of stellar rotation does not necessarily imply a flat metallicity profile. Instead, the steepest profiles in our sample are observed in systems that probably experienced a dwarf-dwarf merger event in the past. Excluding them, the rest of dwarf galaxies show a distribution of mild gradients with little dispersion. These results agree well with several sets of simulations presented in the literature, analysed using the same method.
- Publication:
-
Memorie della Societa Astronomica Italiana
- Pub Date:
- September 2023
- DOI:
- 10.36116/MEMSAIT_94N2.2023.141
- Bibcode:
- 2023MmSAI..94b.141T
- Keywords:
-
- Galaxies: dwarf;
- galaxies: abundances;
- techniques: spectroscopic