The Large-Scale Distribution of Stars in the Ursa Minor Dwarf Spheroidal

Details The Large-Scale Distribution of Stars in the Ursa Minor Dwarf Spheroidal The Large-Scale Distribution of Stars in the Ursa Minor Dwarf Spheroidal

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.0801g&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #08.01; Bulletin of the American Astronomical Society, Vol. 30, p.1257

Astronomy and Astrophysics

Astronomy

Scientific paper

We examine the large-scale distribution of stars surrounding the dwarf spheroidal galaxy in Ursa Minor. We use APM scans of three POSSII fields to obtain photographic B_J and R magnitudes for stars over a 75 square degree area. By selecting only those stars with colors and magnitudes consistent with Umi itself, we eliminate the majority of foreground stars from the analysis. Mapping the remaining stars (primarily those on the horizontal branch) we find some evidence for surface density enhancements on large scales which we associate with tidal tails. We are limited primarily by the depth of the sky-limited plate material; upcoming wide-field CCD imaging campaigns will enable significant improvements in this area.

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