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### HW04

Course: PHY 180, Fall 2007
School: N. Arizona
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Word Count: 182

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Homework PHY180 4 Henrikson Due April 3, 2006. Stars and Stellar Evolution. 1. a. A new planet was just discovered orbiting around a star called 51 Pegasi, which has a parallax of 0.074&quot;. What is its distance in parsecs? Light years? Astronomical Units (AU)? b. If 51 Pegasi were located at 10 parsecs, how bright would it appear to us on earth? (Compared to its present brightness) 2. a. If a star were...

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Homework PHY180 4 Henrikson Due April 3, 2006. Stars and Stellar Evolution. 1. a. A new planet was just discovered orbiting around a star called 51 Pegasi, which has a parallax of 0.074". What is its distance in parsecs? Light years? Astronomical Units (AU)? b. If 51 Pegasi were located at 10 parsecs, how bright would it appear to us on earth? (Compared to its present brightness) 2. a. If a star were half as hot as the sun, but the same luminosity, how big would it be? b. If a star were 100 times luminosity the of the sun, but the same surface temperature, how big would it be? 3. a. In star cluster A the entire main sequence is represented, from spectral type O to M, while in cluster B, there are no stars hotter than spectral type F. What can you say about the relative ages of the two clusters, and why? b. In star cluster C, there are no stars COOLER than spectral type F on the main sequence. What can you say about the relative age of this cluster compared to the two in part A, and why?
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