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.

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Answer 1

Question

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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Star 1 and star 2 have the same V-magnitude, V = 7.5. However, they have different B-magnitudes, B1 = 7.2 and B2 = 8.5. If star 2 has a distance that is 10 times further than star 1, what are the luminosity ratios, L1/L2, in both B- and V-bands?

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Answer 2

Question

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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Answer 3

Question

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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Answer 4

Question

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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Answer 5

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.

Answer 6

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.

Answer 7

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.

Answer 8

(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.

Answer 9

(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.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 19 - Prob. 1CC Ch. 19 - Prob. 2CC Ch. 19 - Prob. 3CC Ch. 19 - Prob. 4CC Ch. 19 - Prob. 5CC Ch. 19 - Prob. 6CC Ch. 19 - Prob. 7CC Ch. 19 - Prob. 8CC Ch. 19 - Prob. 9CC Ch. 19 - Prob. 10CC

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.

Solution Summary: The author explains that Sirius, Vega, Spica, Fomalhaut, and Regulus are younger than the Sun because their main-sequence lifetime is shorter.

Concept explainers

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.

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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Chapter 19 Solutions