WFPC2 Observations of the Ursa Minor Dwarf Spheroidal Galaxy

@article{Mighell1999WFPC2OO,
  title={WFPC2 Observations of the Ursa Minor Dwarf Spheroidal Galaxy},
  author={K. Mighell and Christopher J. Burke National Optical Astronomy Observatories and Y. University},
  journal={The Astronomical Journal},
  year={1999},
  volume={118},
  pages={366-380}
}
We present our analysis of archival Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2) observations in F555W (~V) and F814W (~I) of the central region of the Ursa Minor dwarf spheroidal (dSph) galaxy. The V versus V-I color-magnitude diagram features a sparsely populated blue horizontal branch, a steep thin red giant branch, and a narrow subgiant branch. The main sequence reaches approximately 2 mag below the main-sequence turnoff (V ≈ 23.27 ± 0.11 mag) of the median stellar… CONTINUE READING
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