STELLAR MAPS WITH SIM OUTLINE

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HR DIAGRAM
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     O/B stars
     sdO/sdB stars
     planetary nebulae central stars
     supergiants

???  cool subdwarfs
???  very low metallicity stars
???  very high gravity stars
???  very high velocity stars
???  Galactic Center
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MASS-LUMINOSITY RELATION
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     O/B stars
     clusters beyond a few hundred parsecs
     multiple star systems

???  white dwarfs
???  cool subdwarfs
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GAIA LIMITATIONS
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     roughly 10X less precise than SIM
     limited number of visits (3-30 only for 2D measurements)
          GAIA paper says "every object is observed at least six epochs/year"
     cannot do brighter than V~6
     does not resolve multiple systems
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