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Star Formation History of KDG 61 and KDG 64 From Spectroscopy andColour-Magnitude Diagrams

Published online by Cambridge University Press:  11 July 2011

M. Koleva ,
Ph. Prugniel ,
I. Vauglin ,
L. Makarova ,
M. Koleva ,
D. Makarov  and
Ph. Prugniel
L. Makarova
Affiliation:
Special Astrophysical Observatory, Nizhniy Arkhyz, Karachai-Cherkessia 369167, Russia Université Lyon 1, 69622 Villeurbanne, France, CRAL, Observatoire de Lyon, CNRS, UMR 5574, 69561 St. Genis Laval, France
M. Koleva
Affiliation:
Université Lyon 1, 69622 Villeurbanne, France, CRAL, Observatoire de Lyon, CNRS, UMR 5574, 69561 St. Genis Laval, France Instituto de Astrofisica de Canarias, La Laguna, 38200 Tenerife, Spain Departamento de Astrofisica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
D. Makarov
Affiliation:
Special Astrophysical Observatory, Nizhniy Arkhyz, Karachai-Cherkessia 369167, Russia Université Lyon 1, 69622 Villeurbanne, France, CRAL, Observatoire de Lyon, CNRS, UMR 5574, 69561 St. Genis Laval, France
Ph. Prugniel
Affiliation:
Université Lyon 1, 69622 Villeurbanne, France, CRAL, Observatoire de Lyon, CNRS, UMR 5574, 69561 St. Genis Laval, France
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Abstract

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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 48: CRAL-2010 A Universe of Dwarf Galaxies , 2011 , pp. 65 - 66
Copyright
© EAS, EDP Sciences, 2011

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References

Makarov, D., & Makarova, L., 2004, Ap, 47, 229
Koleva, M., Prugniel, Ph., Bouchard, A., & Wu, Y., A&A, 501, 1269