The Cosmic Perspective Fundamentals (2nd Edition)
2nd Edition
ISBN: 9780133889567
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Question
Chapter 12, Problem 7QQ
To determine
Thestar which is closer to the observer, by comparing the brightness of two Cepheid variable stars.
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Students have asked these similar questions
You measure a star to have a parallax angle of 0.12 arc-seconds
What is the distance to this star in parsecs?
8.33
Hint: d = 1/p
What is the parallax angle of a different star that is twice as far away as the star from the previous problems? [answer in arc-seconds without including the unit]
The total intensity of light measured on earth,
from an ecliptic binary, is plotted in the figure
as a function of time (it's called a light curve).
Careful measurements indicate that the
intensities of the incident light from the stars
corresponding to the minima are respectively
90 and 63 percent of the maximum intensity,
Io.
temperatures of two stars in an eclipsing
binary are T1 and T2 (T1 > T2), and the
corresponding radii
(R1 > R2), respectively.
received
from
both
stars.Surface
аге
R1
and R2
Find the ratio T1/T2.
Round you answer to two significant figures.
1.0-
0.8
1/1o =0.90
0.6-
04-
1|1. =0.63
0.2
1.0
2.0
3.0
4.0
5.0
6.0 Time (days)
Two stars – A and B, of luminosities 0.5 and 4.5 times the luminosity of the Sun, respectively – are observed on Earth to have the same apparent brightness. Which star is more distant, and how much farther away is it than the other? [Hint: The brightness of a star is inversely proportional to the square of its distance; Week 6 slide 15]
Chapter 12 Solutions
The Cosmic Perspective Fundamentals (2nd Edition)
Ch. 12 - Choose the best answer to each of the following....Ch. 12 - Prob. 2QQCh. 12 - Prob. 3QQCh. 12 - Prob. 4QQCh. 12 - Choose the best answer to each of the following....Ch. 12 - Choose the best answer to each of the following....Ch. 12 - Prob. 7QQCh. 12 - Choose the best answer to each of the following....Ch. 12 - Choose the best answer to each of the following....Ch. 12 - Choose the best answer to each of the following....
Ch. 12 - Prob. 11QQCh. 12 - Choose the best answer to each of the following....Ch. 12 - Prob. 13SEQCh. 12 - Explain all answers clearly, with complete...Ch. 12 - Explain all answers clearly, with complete...Ch. 12 - Explain all answers clearly, with complete...Ch. 12 - Prob. 17SEQCh. 12 - Prob. 18SEQCh. 12 - Prob. 19SEQCh. 12 - Explain all answers clearly, with complete...
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- Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0x10-12 watt/m?. How far away is it? Give your answer in both kilometers and light-years.arrow_forward(a) The figure shows the three stars and their velocities. Which star has the largest proper motion? Which star has the smallest proper motion? A B Eartharrow_forwardAn 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.)arrow_forward
- Question 32 Consider three Main Sequence stars, an O tar, an F star and a K star, each with an apparent magnitude of 2. Which star is the most luminous? They're all the same luminosity. The O star The F star The K star Question 33 Consider three Main Sequence stars, an O star, an F star and a K star, each with an apparent magnitude of 2. Which star appears the brightest in the night sky? The O star The F star O The K star O They all appear the same. Please answer botharrow_forwardYou measure a star to have a parallax angle of 0.12 arc-seconds. What fraction of a degree is this? By how many times would you have to magnify this effect for it to be visible to the human eye? (The limit of human vision is about 1 arc-minute) What is the distance to this star in parsecs? What is the distance to this star in light years What is the parallax angle of a different star that is twice as far away as the star from the previous problems? [answer in arc-seconds without including the unit]arrow_forwardYou observe a star with a telescope over the course of a year. You find that this star has a flux that is one-trillionth of the Sun's flux. You also observe a parallax shift for this star of 0.042 arcseconds. What is the luminosity of this star as a multiple of the Sun's luminosity L⊙. [Hint: use the flux formula in the form of a ratio, along with one other formula. Express your answer as a multiple of the Sun's luminosity---e.g., 150 L⊙---entering only that multiple (e.g., you would enter 150).]arrow_forward
- Calculate by how many times Betelgeuse is brighter than the Sun, if its parallax is 0.006 arcsec, and its apparent magnitude is m = +.5. Can you first use the parallax to calculate the distance and then use the magnitude-distance formula to find the absolute magnitude of Betelgeuse and finally, compare it to the absolute magnitude of the Sun which is -26,74 because other experts used other methods and the answer was not correct.arrow_forwardWhich star in the table of stellar data has the largest parallax? Star distance (pc) parallax angle (")| m M A 100 2 В 0.1 4 C 25 0.040 6 D 0.025 А. А О В. В O C.C O D.Darrow_forwardSuppose the distance to a star is doubled. Then the luminosity of the star is Remains the same, and the apparent brightness is decreased by a factor of 4 Decreased by a factor of 2, and the apparent brightness remains the same Decreased by a factor of 4, and the apparent brightness remains the same Remains the same, and the apparent brightness is decreased by a factor of 2arrow_forward
- 15: A star has a parallax angle of 0.0270 arcseconds and an apparent magnitude of 4.641. What is the distance to this star? Answer: 37 16: What is the absolute magnitude of this star? Answer:1.8 17: Is this star more or less luminous than the Sun? Answer "M" for More luminous or "L" for Less luminous. (HINT: the absolute magnitude of the Sun is 4.8) Answer: M 18: What is the luminosity of this star? (HINT: The luminosity of the Sun is 3.85×1026 W.) Please answer question #18, #15-17 are correct, the photos provide the work for them.arrow_forwardStar 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?arrow_forwardLet us imagine that the spectrum of a star is collected and we find the absorption line of Hydrogen-Alpha (the deepest absorption line of hydrogen in the visible part of the electromagnetic spectrum) to be observed at 656.5 nm instead of 656.3 nm as measured in a lab here on Earth. What is the velocity of this star in m/s? (Hint: speed of light is 3*10^8 m/s; leave the units off of your answer)arrow_forward
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