HW#27: pg. 488 Rev 7 – 9, CST 7 – 9
Rev 7 – 9
7. What are T Tauri stars?
8. Stars live much longer than we do, so how do astronomers test the accuracy of theories of star formation?
9. At what evolutionary stages must astronomers use radio and infrared radiation to study prestellar objects? Why can't they use visible light?
CST 7 – 9
7. If the initial interstellar cloud in Figure 19.15 ("Generations of Star Formation") were much more massive, the result would be (a) the formation of more stars; (b) contraction of the cloud due to stronger gravitational attraction; (b) stars forming closer together; (d) stronger shock waves.
8. One of the primary differences betweemm the Pleiades cluster, shown in Figure 19.18(a), and Omega Centauri, shown in Figure 19.19(a), is that the Pleiades cluster is much (a) larger; (b) younger; (c) farther away; (d) denser.
9. If the H-R diagram shown in Figure 19.19(b) ("Globular Cluster") were redrawn to illustrate a much younger cluster, the main sequence turnoff would shift to (a) higher temperature; (b) higher pressure; (c) higher frequency; (d) a spectral classification of K or M.