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In one of my physics classes, I have to construct an H-R Diagram. Now, this does not seems too challenging, and I'm sure it isn't.

I was wondering if someone could kindly guide me in the right direction without giving me an exact answer.

So basically, I have been given some info about a star cluster. I have been given measurements taken through blue and yellow filters and told that the top of the main sequence is at B-V = 0.50 and V = 23.48 and bottom at B - V = 2.74 and V = 23.08.

You see, the B and V values are apparent magnitudes. The way I understand HR diagrams, they require absolute magnitudes. I haven't been given any distances to the star cluster, so how can I find an absolute magnitude? The only info I have been given with regards to its location is that it is in the dir'n of a dust cloud in the milky way.

So any recommendations as to how I should approach this. Thanks a lot everyone :)

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# Absolute Magnitude Calculation, How?

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