Understanding Our Universe
Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 10.3, Problem 10.3CYU
To determine

The quantity required to find the masses of stars in binary system.

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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 in parsecs] 37 What is the absolute magnitude of this star? 1.8 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) M What is the luminosity of this star? (HINT: The luminosity of the Sun is 3.85×1026 W.)
Which main-sequence star would be the least luminous?   a. A   b. B   c. F   d. G   e. K
Which of the following is least reasonable regarding stars on a Hertzsprung-Russell diagram?   1)Stars with the largest radii are found in the upper right of the diagram.   2) Red giants are found in the upper right of the diagram.   3)White dwarfs are found in the lower left of the diagram.   4) On the main sequence, the mass of stars generally increases to the right.
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