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Estimating relative distances for star clusters

  1. Nov 24, 2007 #1
    If star clusters were all about the same physics size, how could one estimate their relative distances?
     
  2. jcsd
  3. Nov 24, 2007 #2

    mgb_phys

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    Either by measuring their angular size or apparent brightness.
     
  4. Nov 24, 2007 #3
    would the distances determined geometrically give the same result as those determined photometrically (using stellar brightness relation)?
     
  5. Nov 24, 2007 #4

    mgb_phys

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    If they were really the same physical diameter then the advantage of measuring their angular diamter is that it isn't affected by anything else ( assuming it is large enough to be detected above atmospheric seeing)
    The problem with measuring brightness is that you have to make assumptions and correct for the absorbtion and re-emmision from the space in between (Interstellar reddening).
     
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