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Author Question: Good tracers of the spiral arms of our galaxy are all I. very old. II. very young. III. very ... (Read 22 times)

JMatthes

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on: Jul 27, 2018
Good tracers of the spiral arms of our galaxy are all I. very old. II. very young. III. very luminous. IV. moving with large radial velocities.
 
  a. I & III
  b. I & IV
  c. II & III
  d. II & IV
  e. I, III, & IV

Question 2

What measurements are needed to determine the orbital motion of a spectroscopic binary star?
 
  What will be an ideal response?


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reversalruiz

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Reply #1 on: Jul 27, 2018
Answer to Question 1

c

Answer to Question 2

Measure the spectra of the binary system over time and determine the Doppler shifts of the spectral lines from each star.


JMatthes

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Reply 2 on: Jul 27, 2018
Excellent

tranoy

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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