Question: The gas shell of the planetary nebula shown in Figure 13-18 is expanding at 24 km/s. Its diameter is 1.5 c y. (a) How

The gas shell of the planetary nebula shown in Figure 13-18 is expanding at 24 km/s. Its diameter is 1.5 c · y.

(a) How old is the gas shell?

(b) If the central star of the planetary nebula is 12 times as luminous as the Sun and 15 times hotter, what is the radius of the central star in units of K_Θ?

Figure 13-18

(a) (9)

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