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A question regarding the B-V measurements of stars

  1. May 1, 2012 #1
    I've been looking up some information regarding the Owl Nebula, in order to make some calculations of my own. I've only been able to find the V magnitude or the general magnitude of the nebula as a whole. Is there any way to find the B magnitude or the B-V measurement of the star, given what data I might be able to scrounge up online?

    Any help is appreciated.
  2. jcsd
  3. May 8, 2012 #2
    B & V are different filters, with the difference of the two (B-V) being a measure of the redness of the object in question - thus red dwarfs have positive B-V values. Pick a star and generally there will be a B-V value for it somewhere in the data. There's also guides which explain and interconvert the different filter systems in use - confusingly, there are many!
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