Statistics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.4810g&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #48.10; Bulletin of the American Astronomical Society, Vol. 26, p.939
Statistics
3
Scientific paper
We present Washington photometry of the dwarf spheroidal galaxies Fornax and Sculptor and new methods for obtaining reddening, metallicity, age, and distance modulus. Our method is based on simultaneous isochrone fits in three independent colours, and on the analysis of metallicity distribution functions of cool stars. For Sculptor, we find a reddening of E_B-V,0=0.045 +/- 0.008 mag and a distance modulus of 19.15 +/- 0.05 mag. We get the best fits for isochrones on the assumption of two main populations, one with an age of 17.3 +/- 0.7 Gyr and a second population with an age of 15.0 +/- 1.4 Gyr. The metallicity distribution shows three abundance populations at [Fe/H] = -1.64 +/- 0.06 dex, at -2.1 +/- 0.1 dex, and at -2.5 +/- 0.5 dex. The first population encompasses =~ 90% of all red giants in our field, while =~ 10% of the red giants belong to the subpopulations. The weighted means we compute for the four main vital statistics of the Fornax field are (1) a reddening of E_(B-V),0=0.045 +/- 0.015 mag, (2) a distance modulus of DM = 20.26 +/- 0.17 mag, (3) abundance of [Fe/H] = --1.32 +/- 0.11 dex, and (4) an age of t = 13.0 +/- 1.6 Gyr. The GC#3 population fits an age of 13.8 +/- 1.1 Gyr, and [Fe/H] = -1.87 +/- 0.11 dex. The metallicity distribution function is in general agreement with these isochrone results, but also reveals a more metal rich subpopulation of stars in the Fornax field. There is evidence of an intermediate age population in the colour magnitude diagrams that is fit by an isochrone of 3 Gyr and an abundance of --1.3 dex. The metallicity of the few stars so identified does not seem metal rich.
Grebel Eva Katharina
Roberts Wm J.
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