The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

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Chapter 18, Problem 27Q

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The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

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Suppose a protostar has a luminosity of 157,341 Lo and a surface temperature of 4,540 K (Kelvins). What is the radius of this protostar? [Enter your answer as a multiple of the Sun's radius. I.e., if you find R = 20 Ro enter 20. This problem is easier if you start with the relevant equation and create a ratio using the Sun's values. Recall that the Sun has a surface temperature of 5778 K. ]

Place the following events in the formation of stars in the proper chronological sequence, with the oldest first and the youngest last. w. the gas and dust in the nebula flatten to a disk shape due to gravity and a steadily increasing rate of angular rotation x. a star emerges when the mass is great enough and the temperature is high enough to trigger thermonuclear fusion in the core y. the rotation of the nebular cloud increases as gas and dust concentrates by gravity within the growing protostar in the center z. some force, perhaps from a nearby supernova, imparts a rotation to a nebular cloud y, then z, then w, then x z, then y, then w, then x w, then y, then z, then x z, then x, then w, then y x, then z, then y, then w MacBook Air on .H. O O O O

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.)

Answer 2

Question

Chapter 18, Problem 27Q

To determine

To explain:

The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

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Answer 3

Question

Chapter 18, Problem 27Q

To determine

To explain:

The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

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Answer 4

Question

Chapter 18, Problem 27Q

To determine

To explain:

The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

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Answer 5

Chapter 18, Problem 27Q

To determine

To explain:

The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

Answer 6

Chapter 18, Problem 27Q

To determine

To explain:

The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

Answer 7

Chapter 18, Problem 27Q

To determine

To explain:

The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

Answer 8

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Answer 9

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Answer 11

Ch. 18 - Prob. 1Q Ch. 18 - Prob. 2Q Ch. 18 - Prob. 3Q Ch. 18 - Prob. 4Q Ch. 18 - Prob. 5Q Ch. 18 - Prob. 6Q Ch. 18 - Prob. 7Q Ch. 18 - Prob. 8Q Ch. 18 - Prob. 9Q Ch. 18 - Prob. 10Q

The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

Solution Summary: The author explains that red giants and protostars are located in the same region of the H-R diagram.

Concept explainers

To explain:

The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

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Chapter 18 Solutions

The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

Solution Summary: The author explains that red giants and protostars are located in the same region of the H-R diagram.

Concept explainers

To explain: The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

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Chapter 18 Solutions

To explain:

The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.