9/ The star Betelgeuse has a wavelength of maximum
emission of 923.5 nm, whereas the star...
9/ The star Betelgeuse has a wavelength of maximum
emission of 923.5 nm, whereas the star Bellatrix has a wavelength
of maximum emission of 131.8 nm. Which star is colder
A/ more info
B/ Bellatrix
C/ Betelgeuse
D/ same temperature
10/ Which of the following correctly lists the spectral
sequence of stars in order of decreasing surface
temperature?
A/ O,B,A,F,G,K,M
B/ M,K,G,F,A,B,O
C/ O,M,K,G,F,B,A
D/ A,B,F,G,K,M,O
11/ How is a star assigned its spectral
type?
A/ The star’s spectrum is...
Consider a star cluster that starts out with main sequence
stars of spectral type O, B,...
Consider a star cluster that starts out with main sequence
stars of spectral type O, B, A, F, G, K, M.
Explain which spectral types will be present when the cluster
is 108 years old.
Explain which will be present when it is 1010 years
old. (Note: Review the slide in the "Stars" lecture that shows the
lifetimes of stars on different parts of the HR diagram to help you
answer this question)
Consider a star cluster that starts out with main sequence
stars of spectral type O, B,...
Consider a star cluster that starts out with main sequence
stars of spectral type O, B, A, F, G, K, M.
Explain which spectral types will be present when the cluster
is 108 years old.
Explain which will be present when it is 1010 years
old. (Note: Review the slide in the "Stars" lecture that shows the
lifetimes of stars on different parts of the HR diagram to help you
answer this question)