Essential Cosmic Perspective
Essential Cosmic Perspective
9th Edition
ISBN: 9780135795033
Author: Bennett
Publisher: PEARSON
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Chapter 14, Problem 41EAP

(a)

To determine

The size of the super-giant star.

(b)

To determine

The Schwarzschild radius of the Cygnus X-1 black hole.

(c)

To determine

To Compare: The size of the black hole and supergiant star.

(d)

To determine

Whether it is difficult for a matter to fall directly into black holeof this size.

(e)

To determine

Compatibility of the accretion disk around the black hole.

(f)

To determine

Accuracy of the portrayal of the supergiant and black hole binary system.

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A star with spectral type A0 has a surface temperature of 9600 K and a radius of 2.2 RSun. How many times more luminous is this star than the Sun? (if it is less luminous enter a number less than one) 36.854 This star has a mass of 3.3 MSun. Using the simple approximation that we made in class, what is the main sequence lifetime of this star? You may assume that the lifetime of the sun is 1010 yr.
A star with spectral type A0 has a surface temperature of 9600 K and a radius of 2.2 RSun. How many times more luminous is this star than the Sun? (if it is less luminous enter a number less than one) This star has a mass of 3.3 MSun. Using the simple approximation that we made in class, what is the main sequence lifetime of this star? You may assume that the lifetime of the sun is 1010 yr. Compare this to the lifetime of a A0 star listed in Table 22.1 (computed using a more sophisticated approach). Is the value you calculated in the previous problem longer or shorter than what is reported in the table? (L for longer, S for shorter) (You only get one try at this problem.)
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Chapter 14 Solutions

Essential Cosmic Perspective

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