 Solution

ID: past-exam-of-the-short-options-paper-shared-by-prelims-and-parts-a-and-b-of-the-physics-course-of-the-university-of-oxford/2016/s26/1/3/a/solution

Hot bright stars lie toward the upper left: smaller

B - V

means bluer/hotter, and smaller numerical

V

means brighter. The vertical axis is inverted in the original diagram. The plot shows apparent magnitudes, but cluster members at a common distance permit relative luminosity comparisons.

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