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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Asked Mar 23, 2020
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      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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