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Author Question: Why must both parallax and proper motion be known to give transverse velocity? What will be an ... (Read 31 times)

chads108

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on: Jul 27, 2018
Why must both parallax and proper motion be known to give transverse velocity?
 
  What will be an ideal response?

Question 2

Which of these is NOT typical of the Galaxy's spiral arms?
 
  A) open clusters
  B) Population II giants like orange Arcturus
  C) emission nebulae like M42
  D) hot, young blue Population I stars
  E) O and B stars


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Jordin Calloway

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

To turn the star's apparent motion across our line of sight into its real velocity in that direction, we also need to know the actual distance from parallax data.

Answer to Question 2

B


chads108

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Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

bdobbins

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Reply 3 on: Yesterday
Excellent

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