WFPC2 Observations of Leo A: A Young Galaxy?

Details WFPC2 Observations of Leo A: A Young Galaxy? WFPC2 Observations of Leo A: A Young Galaxy?

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mcdg.proc..213t&link_type=abstract

The Magellanic Clouds and Other Dwarf Galaxies, Proceedings of the Bonn/Bochum-Graduiertenkolleg Workshop, held at the Physikzen

Other

Cepheids, Colour-Magnitude Diagrams, Stellar Populations

Scientific paper

The unprecedented detail of the HST CMD of Leo A leads to a new distance determination which comes from the position of the Red Clump, the Blue Loops and the tip of the Red Giant Branch. We obtain a distance modulus, m-M = 24.2 +/- 0.2, or 690 +/- 60 kpc. We suggest that a burst of star formation at some point in the past has led to an anomalously high number of W Virginis or Anomalous Cepheid variable stars in this galaxy, which were earlier misidentified as classical delta-Cepheid variable stars. From our interpretation of the features present in the WFPC2 CMDs at this new distance we show a good match with extremely low metallicity young models (Z = 0.0004), and the strong possibility that we are looking at a predominantly young galaxy, which is of order <= 2 Gyr old, although we cannot rule out the possibility of an older, underlying globular cluster age population.

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