Alnitak colour

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    Arthur Fentaman
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    When observing Alnitak zeta Orionis recently, I noticed that one side of it appears creamy yellow and the other side blue.

    Increasing magnification split the stars into a double consisting of a blue white with a yellow companion.

    The main star is listed as a class O with the companion being a B2 III. Neither of these stars are yellow so what is giving the yellow appearance? 

    Unfortunately I am unable to image this but wondered if someone could explain what I am seeing.

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