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The age and metallicity of the bötes i system

Astronomical Journal, ISSN: 0004-6256, Vol: 136, Issue: 6, Page: 2321-2331
2008
  • 10
    Citations
  • 0
    Usage
  • 3
    Captures
  • 0
    Mentions
  • 0
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    10
    • Citation Indexes
      10
  • Captures
    3

Article Description

We present Washington CT T photometry of a field central to the Boötes I dwarf spheroidal galaxy, which was discovered as a stellar overdensity in the Sloan Digital Sky Survey (DR5). We show that the Washington filters are much more effective than the Sloan filters in separating the metal-poor turn-off stars in the dwarf galaxy from the foreground stars. We detect 165 objects in the field, and statistically determine that just over 40% of the objects are nonmembers. Our statistical analysis mostly agrees with radial velocity measurements of the brighter stars. We find that there is a distinct main-sequence turn-off and subgiant branch, where there is some evidence of a spread in chemical abundance. Any evidence of an age spread is limited to a few billion years. The brightest seven Boötes I members give a (photometric-color derived) weighted mean iron abundance of [Fe/H] = -2.1 , and the best-fit isochrone is the 14.1 Gyr, Z = 0.0002 model, with (m - M) = 19.11 and E(B - V) = 0.02. © 2008. The American Astronomical Society. All rights reserved.

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