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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.

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.

Astronomy
Astronomy
1st Edition
ISBN:9781938168284
Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff
Chapter20: Between The Stars: Gas And Dust In Space
Section: Chapter Questions
Problem 36E: H II regions can exist only if there is a nearby star hot enough to ionize hydrogen. Hydrogen is...
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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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