The sketch (Figure 10.31) shows an HR diagram with five stars indicated (points A-E) along with the main sequence. a) Which star is largest? b) Which star is smallest? c) Which star is hottest? d) Which star is most like the Sun? e) Which star is the late-type supergiant? f) Which star has strong lines of ionized helium? g) Which star has strong lines of ionized calcium? Figure 10.31. The HR diagram for Question 17..