Chapter Questions
Suppose a star radiates most strongly at about $200 \mathrm{nm}$. How hot is it?
The bright southern star Alpha Centauri radiates most strongly at about $500 \mathrm{nm}$. What is its temperature? How does this compare to the Sun's?
A star radiates most strongly at $850 \mathrm{nm}$. What spectral type is it?
If a $\mathrm{T}$ star has a surface temperature of $1000 \mathrm{K}$, at what wavelength should it be brightest?
If a star has very faint Balmer lines, what are the next steps involved in determining its spectral type?
When our star reaches the end of its main-sequence lifetime, it will become an M-class red giant (Unit 64) with a surface temperature of approximately 3300 K. How will its wavelength of peak radiation differ from the current value?
Suppose a star radiates most strongly at $330 \mathrm{nm}$. Would you expect to see strong absorption lines in its spectrum? Why or why not?