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Hertzsprung-Russell Diagram

Hertzsprung-Russell Diagram

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A brand new telescope has been named after you. It is therefore only fitting that you get to make the very first set of observations. During your first night observing, you first measure the apparent brightness and spectrum of a group of stars that appear close to each other within the telescopes field of view. From a separate set of observations 6 months later, you are able to measure each star’s parallax. Next you plot the luminosity and temperature of each star in a Hertzsprung-Russell Diagram 

  1. What features below help you conclude that the group of stars is a star cluster? Explain
  2. Approximately how old do you think this star cluster is? Explain
  3. How do you expect the spectrum of the most luminous and least luminous main sequence stars in the cluster to differ? Explain why these differences occur in terms of the star’s properties and any measured absorption lines. 
  4. A year after your discovery, another new star cluster has been found by the same telescope, but its distance is too far to be measured by parallax. What alternative methods could be used to measure the distance to this new cluster
104 102 100- 10 2- 10et 6 x 103 4 x 10 3х 103 2 x 10 10 4 Temperature (K)- Figure 2: Luminosity and temperature of individual stars that you observed with your telescope. 07/7
Transcribed Image Text:104 102 100- 10 2- 10et 6 x 103 4 x 10 3х 103 2 x 10 10 4 Temperature (K)- Figure 2: Luminosity and temperature of individual stars that you observed with your telescope. 07/7
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