21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 13.4, Problem 13.4CYU

(a)

To determine

The qualities which describe the qualities of the star in the lower right of H-R diagram.

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3) indicate which locations in the H-R diagram correspond to places where the evolution is slow. Answers should be in the order they occur in the star. For example, if, in order, E, I and A are locations where there is a long time between changes, then enter EIA. (HINT: There are exactly three of them Hint: Hint: Our sun will be stable for another 4 billion years and white dwarfs last a long time because they are small. Really good additional hint: There are 3 places where the evolution is slow. Info below is what each of the labels are.  1) red giant, helium flash A2) white dwarf F3) red giant with helium burning shell B4) hydrogen fusion in shell around core I5) helium fusion in core D6) envelope ejected, planetary nebula H7) main-sequence star C8) helium used up, core collapses G9) hydrogen used up, core collapses E
Choose the correct statements concerning spectral classes of stars. (Give ALL correct answers, i.e., B, AC, BCD...) A) Neutral hydrogen lines dominate the spectrum for stars with temperatures around 10,000 K because a lot of the hydrogen is in the n=2 level.   B) Hydrogen lines are weak in type O-stars because most of it is completely ionized.   C) Oh Be A Fine Guy/Girl Kiss Me, is a mnemonic for remembering spectral classes.   D) The spectral sequence has recently been expanded to include L, T, and Y classes.   E) K-stars are dominated by lines from ionized helium because they are so hot.   F) The spectral types of stars arise primarily as a result of differences in temperature.
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