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Review Questions for Exam #2

Review Questions for Exam #2. In order to figure out the mass of a star we observe binary star systems and use Kepler’s 3 rd Law, (M 1 + M 2 ) P 2 = 4 π 2 *a 3 /G Discuss how we determine, P and a. How do we solve for individual mass (like M 1 ) rather than (M 1 + M 2 )?.

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Review Questions for Exam #2

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  1. Review Questions for Exam #2

  2. In order to figure out the mass of a star we observe binary star systems and use Kepler’s 3rd Law, (M1 + M2) P2 = 4π2*a3/GDiscuss how we determine, P and a.How do we solve for individual mass (like M1) rather than (M1 + M2)?

  3. Sketch an H-R diagram. Label the axes and indicate the direction of increase along each axis. • Draw in the location of the main-sequence, super giants (I) the giants (III) and the white dwarfs. • On the main-sequence, indicate with an arrow the direction of increasing mass. • Given the arrow that you have drawn, how are luminosity and mass related on the MS and why? • Put a big “R” in the place where on the diagram where the radii are the biggest. Put a “r” where the radii are the smallest. • Given the relation L = σT4(4πR2) explain why the “R” and “r” are at the locations you have labeled

  4. Here is an image near the center of the Orion nebula, a star forming region. • Explain what is happening in this picture • Explain how this is related to the process of self-sustained star formation in the molecular cloud.

  5. Fe

  6. Discuss how the absorption lines form. What has to be true about the electrons in order to create absorption lines? • What do the strength of the absorption lines depend on? • In the spectra below, the temperature is the same for all three spectra. Why are the lines different strengths?

  7. Explain what is happening to the proto-star as it follows the track below.

  8. Explain this diagram • What is going on at #1, #2, #3, #4? • In #3 what is happening on the outside of the star? Why? #3 #4 #2 #1

  9. Explain why a high mass core cannot get energy out of fusion of Iron. • What happens to the core of a high mass star when it becomes iron? • How does it produce a supernova?

  10. Explain why a neutron star spins incredibly fast. • How do we know that neutron stars really do spin rapidly? • What objects show us that neutron stars spin fast? • How does this object work?

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