Answer
We expect these older stars to be hotter.
Work Step by Step
It takes a very high temperature and density for three $\alpha$ particles to be pushed together to fuse and produce carbon.
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 43 - Nuclear Physics - Problems - Discussion Questions - Page 1474: Q43.8
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