Using the Technique of Main- Sequence Fitting to Determine the Distance

Using the technique of main- sequence fitting to determine the distance to a star cluster requires that .

A) we use ultraviolet and X- ray telescopes
B) we have telescopes powerful enough to allow us to identify the spectral types of main- sequence stars of many masses in the cluster
C) the cluster be near enough for us to measure the parallax of its stars
D) we have a well- calibrated period- luminosity relation for Cepheid variable stars

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