When a Solar-Mass Star Is Ejecting a Planetary Nebula,the Temperature

question 282

Multiple Choice

When a solar-mass star is ejecting a planetary nebula,the temperature of its exposed core can reach 100,000 K.How does this temperature compare with the core temperature when the star is on the main sequence?

• A) The exposed core is cooler simply because it is exposed to the cold regions of space.
• B) The exposed core is cooler because it is at the end of its fuel supply.
• C) The exposed core is hotter because it was heated by helium fusion rather than hydrogen fusion.
• D) The exposed core is hotter because it was heated by carbon-oxygen fusion rather than hydrogen fusion.

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