21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 13, Problem 41QP
To determine

The star which is large.

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If two stars, star A and star B, have equal radii, but star A is ten times more luminous than star B, what can we conclude about the temperature of star B relative to star A (the ratio TB/TA)?
You receive 8 × 10−9 W/m2 of energy from a star that is 2 parsecs away, it has a V -band apparentmagnitude mV = −1.5. How much more/less flux do you receive from a star with an apparent magnitudemV = 5.3? For the first star, what is its V -band absolute magnitude?
A nearby star has a parallax of 0.317 arcseconds. How long does it take the light from this star to reach us?
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