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What is degenerate matter and why is it important to the study of stars?

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Give ALL correct answers referring to the properties of known stars, i.e., B, AC, BCD... A) On the main sequence, more massive stars are colder. B) High mass stars are the most numerous type of stars observed in the galaxy. C) Giants are colder than main sequence stars at the same luminosity. D) Giants are brighter than dwarfs at the same temperature. E) On the main sequence, more massive stars are dimmer. F) White dwarf stars are much denser than main sequence stars. Hint: White dwarf stars have about the mass of our sun, but are only the size of the Earth. Therefore, they have a very high density.
Match each statement with the appropriate item (If the first corresponds to B and the next 4 to C, enter BCCCC) 1) stars that have evolved off the main sequence and are growing in luminosity due to a hydrogen burning shell 2) young, spread out star cluster 3) cooler stars in a cluster that have not yet evolved off the main sequence 4) stars that are burning helium in their core 5) old, dense star cluster A. red-giant branch B. open cluster C. lower main sequence D. horizontal branch stars E. globular cluster
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The figure above shows a track on the H-R diagram corresponding to the evolution of a star like the one you’ve just considered. Six stages are numbered. Six stages of stellar evolution are listed below – for each stage, write the number corresponding to its position on the diagram (four of these stages are the same stages you considered in the first part of this tutorial). Horizontal branch: Asymptotic giant branch: White dwarf: Main sequence: Planetary nebula: Red giant branch: What is the approximate mass of this star, in solar masses? Explain how you can tell.
What are the main products of the fusion reactions that take place in low mass main sequence stars?
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