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

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

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011eas....48...65m&link_type=abstract

EAS Publications Series, Volume 48, 2011, pp.65-66

Astronomy and Astrophysics

Astrophysics

Scientific paper

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.

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