009 Lab 07 Summary Key - lab assistance PDF

Title	009 Lab 07 Summary Key - lab assistance
Course	Sun, Stars And Galaxies
Institution	Binghamton University
Pages	1
File Size	76.4 KB
File Type	PDF
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Astronomy 115 Summary Questions Lab #7 – The H-R Diagram 1. Write statements (complete sentences) of the relationship between the following quantities/properties of main sequence stars: a. mass and radius: The greater the mass of the MS star, the larger its radius.

b. mass and luminosity: The greater the mass of the MS star, the greater its luminosity.

c. spectral temperature and luminosity: The greater the spectral temperature of the MS star, the greater its luminosity.

d. luminosity and radius: The greater the luminosity of the MS star, the greater its radius.

e. spectral temperature and mass: The greater the spectral temperature of the MS star, the greater its mass.

2. Using the interactive graphics in Lesson 1 (H-R diagram) and the Stefan-Boltzmann Law, determine the radius of each of the following stars (show logic and work): a. Arcturus Use Stephan-Boltzmann Law and RActurus = 23RSun since from Lesson 1, the luminosity of Arcturus is 170 times the luminosity of the Sun and the temperature of Arcturus is4390/5800 times the temperature of the Sun.

b. Betelgeuse Use Stephan-Boltzmann Law and RBetelgeuse = 675RSun since from Lesson 1, the luminosity of Betelgeuse is 52,000 times the luminosity of the Sun and the temperature of Betelgeuse is 3370/5800 times the temperature of the Sun. Note: Students would be expected to show more work than what is done above – showing the equations and substitutions....