AST1120-lab6

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1120

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Astronomy

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Apr 3, 2024

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AST 1120: Stellar Astronomy Name: Lab 6 (40 points) Stellar Evolution Learning Goals Describe key differences between open star clusters and globular star clusters Determine the age of a star cluster from its main sequence turnoff point Describe the HR diagram of a globular star cluster Explain how stars evolve after leaving the main sequence Part 1 – Star Clusters Read about star clusters in Chapter 22.2 and use that information to answer the following questions. Figure 1 – Pleiades open cluster 1. The star cluster pictured at top left is the Pleiades, in the constellation Taurus. Describe some of the evidence that this is a young, open cluster. Figure 2 - 47 Tucanae globular cluster 2. The star cluster at bottom left is 47 Tucanae, in the southern constellation of Tucana. Describe some of the evidence that this is an old, globular cluster
You can read more about the Main Sequence Turnoff in Chapter 22.3 . 107 below is really 10 7 , 108 is 10 8 , etc. where 10 7 years is 10 million years. 10 10 years is 10 billion years Figure 3 - Star Clusters Plotted on an H-R Diagram 3. Which cluster on the chart above is youngest? Explain how you know this. 4. Which cluster on the chart above is oldest? Explain how you know this. Check out this site about the goals of the Gaia mission . It may take a minute to load. You will need to scroll down to advance the site. 2
5. How many stars are shown in the Gaia image? 6. What causes the dark patches in the Milky Way? 7. What properties are used to sort the star cluster stars? 8. Click on the box for NGC0869 (h Persei). What color star is highlighted? 9. Click on the box for NGC0104 (47 Tucanae). What color star is highlighted? 10.Click on All 47 clusters. As you continue to scroll down, what happens to the blue stars? Part 2 – Stellar Evolution Open your Star in A Box . Select Advanced before you open the lid. M ʘ = M sun In Star In a Box, you can select the Mass in the bottom left (this is the Mass on the Main Sequence). Click the clock icon in the bottom right to see the clickable stages of the 3
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