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H-R diagrams (B-V)

  1. Dec 17, 2009 #1
    I was plotting the color magnitude diagram of a globular cluster and I noticed something odd. On most H-R diagrams, the turn-off from the main sequence to the giant branch is somewhere between (B-V) magnitude values of about .5-1.0.

    On my plot, the turn-off is between about -.4 and -0.1.

    I am assuming that there is some data adjustment being done that I have missed.

    I am also kind of puzzled by the presence of what appear to be a few hot stars, either super-giants or stars that are much hotter than the sun, neither of which should be present in a globular cluster where the stars are about the age of the Milky Way.
  2. jcsd
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