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Download Quiz Solution: 1 April 2013 What does it mean when an astronomer
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Quiz Solution: 1 April 2013 What does it mean when an astronomer says that a star "moves" from one place to another on an H-R Diagram? Can you provide an example of this? As stars evolve and change structure, their radii and temperatures also change. Since a star's luminosity is dependent on both temperature and radius, the luminosity also can change as a star evolves. If we plot a single star in an H-R diagram at several different stages of evolution we will find that it is located in different regions of the diagram. In this way, we speak of a star "moving" in the H-R diagram because of structural changes as the star evolves. The path that a star moves on in the H-R diagram is called an evolutionary track. Example: End of core hydrogen fusion and the ascent of the red giant branch (RGB)