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K Name: Luminosity, Temperature, and Size The graph below plots the luminosity of a star on the vertical axis against the star's surface temperature on the horizontal axis. This type of graph is called an H-R diagram. Use the H-R diagram below and the relationship between a star's luminosity, temperature, and size (as described on the previous page) to answer the following questions concerning the stars labeled U-Y. 10,000 1,000 ox 100 10 W Luminosity (solar units) .01 001 - V 0001 20,000 10,000 5,000 Temperature (K) 1) Stars U and V have the same surface temperature. Given that Star U is actually much more luminous than Star V, what can you conclude about the size of Star U compared to Star V? Explain your reasoning. 2) Star U has a greater surface temperature than Star X. Given that Star X is actually just as luminous as Star U, what can you conclude about the size of Star X compared to Star U? Explain your reasoning