a-105 study guide 2

# 24 what is the definition of stellar parallax what

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24. What is the definition of stellar parallax? What baseline is used in determining the parallax of a star and what is the length of this baseline? Draw a diagram showing how parallax is used in the determination of the distance of a nearby star. 25. What are the parallaxes of stars at distances of: (a) 1 pc (b) 3 pc (c) 15 pc 26. The Hipparcos satellite was able to detect parallaxes as small as 0.001 arcsec. What is the greatest distance to which it can measure a parallax? Express your answer both in parsecs and light years. 27. Define the quantities luminosity and apparent brightness. Explain how two stars with the same luminosity can have different apparent brightness. Explain how two stars with the same apparent brightness can have different luminosity. 28. Explain how we can determine the distance of a star if we know both its luminosity and apparent brightness. 29. Two stars have the same luminosity. Star 2 is 5 × as distant as Star 1. How does the apparent brightness of Star 2 compare with that of Star 1? 30. What do each of the quantities in the ideal gas law represent? 31. Suppose that a helium balloon is moved from a warm room to the cold outdoors. Based on the ideal gas law, what will happen to the balloon and why?

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