Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 17, Problem 2Q
To determine
The reason for requirement of 6 months to make a measurement of a star’s parallax.
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Students have asked these similar questions
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.
the parallax angle of a star to be 0.002 arc-seconds. what would the distance be to this star?
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]
Chapter 17 Solutions
Universe: Stars And Galaxies
Ch. 17 - Prob. 1QCh. 17 - Prob. 2QCh. 17 - Prob. 3QCh. 17 - Prob. 4QCh. 17 - Prob. 5QCh. 17 - Prob. 6QCh. 17 - Prob. 7QCh. 17 - Prob. 8QCh. 17 - Prob. 9QCh. 17 - Prob. 10Q
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- A certain star has a parallax of 0.647 arcseconds. How far away is it (in metres)? [Type in the numerical value and units e.g. 1.23E+16m]arrow_forwardUse a diagram to explain what is meant by the parallax angle, p, for a star observed twice from Earth, with a 6-month interval between each observation. Hence define the parsec, and calculate its value in astronomical units and metres. The star Betelgeuse is observed to have a parallax angle p = 4.5 × 10−3 arcseconds. State the distance of Betelgeuse in units of parsecs and light years.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_forward
- In the parallax method of determining stellar distances, the angle to a star is measured while the earth is on one side of the sun and then again six months later, as in the diagram below. Assume the earth-sun distance is 1 Astronomical Unit. The parallax angle of Alpha Centauri is 0= 2.1 x 10-4 ° . Find the distance from the sun to a Centauri in light years. Assume a circular orbit for the Earth. a Centauri Earth (June) Earth (December) Sunarrow_forwardWhich of the following is a true statement? A smaller diameter star can never have a smaller number for its apparent magnitude than a larger star. Two stars with the same diameter and effective surface temperature will necessarily have the same absolute magnitude as well. Aristotle was the first person to detect stellar parallax. All G2 stars necessarily have the same absolute magnitude.arrow_forwardAccording to the equation d=1/p, a star whose parallax angle is 1/50” is how far away?arrow_forward
- The a star system contains two stars, one with apparent magnitude m = 10.5 and the other with m = 10.9. What is the combined apparent magnitude of the two stars?arrow_forwardThe apparent visual magnitude of Arcturus is m = -0.04 mag. Use the method of spectroscopic parallax to calculate the approximate distance to Arcturus in units of pc.arrow_forwardStar A is located 5 times further from Earth than Star B. Star B has a 0.020 arc second stellar parallax. How far from Earth (in pc) is Star A?arrow_forward
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