PROBLEM SET 5 Physics 2022 1. What temperature and spectral classification would you give to a star with equal line strengths of hydrogen (H) and neutral helium (He I)? Explain. 2. The bright star Rigel in the constellation Orion has a surface temperature about 1.6 times that of the Sun. Its luminosity is about 64,000 L ʘ . What is Rigel’s radius compared to the radius of the Sun? 3. Star P has double the radius of star Q. Stars P and Q have surface temperatures 4000 K and 8000 K, respectively. Which star has the greater luminosity? How many times greater is it? 4. Star X has 12 times the luminosity of star Y. Stars X and Y have surface temperatures of 3500 K and 7800 K, respectively. Which star is larger? How many times larger is it? 5. The bright star Zubeneschmali ( β Librae) is of spectral type B8 and has a luminosity of 130 L ʘ . What is the star’s approximate surface temperature? How does its radius compare to that of the Sun? 6.
This is the end of the preview.
access the rest of the document.