Stromgren & Washington Photometry of dSph Systems

Details Stromgren & Washington Photometry of dSph Systems Stromgren & Washington Photometry of dSph Systems

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441905h&link_type=abstract

American Astronomical Society, AAS Meeting #214, #419.05; Bulletin of the American Astronomical Society, Vol. 41, p.688

Astronomy and Astrophysics

Astronomy

Scientific paper

Using the APO 3.5-m telescope, we have investigated the metallicity and age distributions of the dwarf spheroidal systems, Bootes I, CVn II, UMa II and Bootes II using a combination of Washington and Stromgren colors and indices. Our data shows that Bootes I and UMa II have a spread in [Fe/H] > 1 dex, using the red giant branch and the main sequence turn-off. Previous photometry and spectroscopy of the RGB stars in Bootes I have shown a spread in [Fe/H], but the use of the m1-index allows us to break the age-metallicity degeneracy and investigate the star formation history of these dark matter-dominated systems.

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