| Issue |
EAS Publications Series
Volume 48, 2011
CRAL-2010 A Universe of Dwarf Galaxies
|
|
|---|---|---|
| Page(s) | 65 - 66 | |
| Section | Star Formation History and Chemical Enrichment | |
| DOI | https://doi.org/10.1051/eas/1148012 | |
| Published online | 11 July 2011 | |
M. Koleva, Ph. Prugniel and I. Vauglin (eds)
EAS Publications Series, 48 (2011) 65–66
Star Formation History of KDG 61 and KDG 64 From Spectroscopy and Colour-Magnitude Diagrams
1 Special Astrophysical Observatory, Nizhniy Arkhyz, Karachai-Cherkessia 369167, Russia
2 Université Lyon 1, 69622 Villeurbanne, France, CRAL, Observatoire de Lyon, CNRS, UMR 5574, 69561 St. Genis Laval, France
3 Instituto de Astrofisica de Canarias, La Laguna, 38200 Tenerife, Spain Departamento de Astrofisica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
We present a study of two dE/dSph members of the nearby M 81 group of galaxies, KDG 61 and KDG 64. Direct HST/ACS images and integrated-light spectra of 6 m telescope of Special Astrophysical Observatory (Russia) have been used for quantitative star formation history analysis. The spectroscopic and colour-magnitude diagrams analysis gives consistent results. These galaxies appear to be dominated by an old population (12–14 Gyr) of low metallicity ([Fe/H] ∼−1.5). Stars of ages about 1 to 4 Gyr have been detected in both galaxies. The later population shows marginal metal enrichment. Our radial velocity measurement suggests that the HII knot on the line-of-sight of KDG 61 is not gravitationally attached to the galaxy.
© EAS, EDP Sciences, 2011