What does the fact that Sirius is a blue-white star of great luminosity tells about the temperature of the star.

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Answer 1

Question

Chapter 18, Problem 45E

(a)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the temperature of the star.

(b)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the average density of the star.

(c)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the position in H-R diagram of the star.

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Many of the bright stars in the night sky are highly luminous normal blue stars (such as Acrux), and others are blue giants (such as Rigel) or red giants (such as Betelgeuse). Generally, such stars have a luminosity of 103 to 105 times that of our Sun! Ignoring any effects from our atmosphere, how bright would a star with a luminosity of 8380 solar luminosities be if it were located 620 light years from Earth? (You will need to convert some values.) W/m² For comparison, if you were 1 meter from a regular 100 W light bulb, the brightness would be 7.96 W/ m². (Since stars are not this bright, your answer should be considerably less!) Kind of amazing you can see these things, isn't it?

We will take a moment to compare how brightly a white dwarf star shines compared to a red giant star. For the sake of this problem, lets assume a white dwarf has a temperature roughly twice as large as a red giant star. As for their stellar radii, the white dwarf has a radius about 1/10000th that of a red giant star. With this in mind, how does the luminosity of a red giant star compare to that of a white dwarf? (Put differently, find the ratio of their luminosities a.k.a. how many times more luminous is the red giant than the white dwarf? An answer of less than 1 means the white dwarf is more luminous, an answer of 1 means they have the same luminosity, and an answer greater than 1 means the red giant is more lu

An O8 V star has an apparent visual magnitude of +5. Use the method of spectroscopic parallax to estimate the distance to the star (in pc). (Hints: Refer to one of the H–R diagrams in the chapter, and use the magnitude–distance formula, d = 10(mV − MV + 5)/5 where d is the distance in parsecs, mV and MV are the apparent and absolute visual magnitude respectively.)

Answer 2

Question

Chapter 18, Problem 45E

(a)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the temperature of the star.

(b)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the average density of the star.

(c)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the position in H-R diagram of the star.

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Answer 3

Question

Chapter 18, Problem 45E

(a)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the temperature of the star.

(b)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the average density of the star.

(c)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the position in H-R diagram of the star.

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 4

Question

Chapter 18, Problem 45E

(a)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the temperature of the star.

(b)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the average density of the star.

(c)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the position in H-R diagram of the star.

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 5

Chapter 18, Problem 45E

(a)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the temperature of the star.

(b)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the average density of the star.

(c)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the position in H-R diagram of the star.

Answer 6

Chapter 18, Problem 45E

(a)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the temperature of the star.

Answer 7

Chapter 18, Problem 45E

(a)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the temperature of the star.

Answer 8

(b)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the average density of the star.

Answer 9

(b)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the average density of the star.

Answer 10

(c)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the position in H-R diagram of the star.

Answer 11

(c)

To determine

What does the fact that Sirius is a blue-white star of great luminosity tells about the position in H-R diagram of the star.

Answer 12

Expert Solution & Answer

Answer 13

Expert Solution & Answer

Answer 14

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Answer 15

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

What does the fact that Sirius is a blue-white star of great luminosity tells about the temperature of the star.

Solution Summary: The author analyzes how Sirius is a blue-white star of great luminosity, suggesting that the temperature of the star is high.

Concept explainers

What does the fact that Sirius is a blue-white star of great luminosity tells about the temperature of the star.

What does the fact that Sirius is a blue-white star of great luminosity tells about the average density of the star.

What does the fact that Sirius is a blue-white star of great luminosity tells about the position in H-R diagram of the star.

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Chapter 18 Solutions