Universe
Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 19, Problem 23Q

(a)

To determine

The reason that the main-sequence stars such as Sirius (spectral type A1), Vega(A0), Spica (B1), Fomalhaut (A3), and Regulus (B7), among the 20 brightest stars, are younger than Sun.

(b)

To determine

Whether α Centauri A is younger, older, or of the same age as the Sun. Given that it has the same main sequence as of Sun, type G2, and it is the third brightest star of the universe.

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