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lec20 - Lecture 20 Stellar Interior Lecture 20 Purdue...

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Lecture 20 Stellar Interior Purdue University, Astronomy 364 1 Lecture 20
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Stellar Evolution Lecture 20 Purdue University, Astronomy 364 2
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H-R Diagram for Clusters Lecture 19 Purdue University, Astronomy 364 3
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Quiz The H-R diagrams of two star clusters are shown. Which cluster is older? 1. M 67 2. NGC 188 3. Same age 4. Cannot tell Lecture 20 Purdue University, Astronomy 364 4
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Spectroscopic Parallax Determine the spectral type of a star. – Types of emission and absorption lines Determine the luminosity class of the star. – Width of the lines Find the intersection of the spectral type and luminosity class on the H-R diagram and read off the absolute magnitude. Measure the apparent magnitude of the star. Use the distance modulus to determine the distance of the star. Lecture 20 Purdue University, Astronomy 364 5
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Lecture 20 Purdue University, Astronomy 364 6
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Example Lecture 20 Purdue University, Astronomy 364 7 An M5 main sequence star has an absolute magnitude M v = 12.3 mag. The apparent magnitude of an O5V star is determined to be m v = 17.3 mag, the distance of the star can be estimated from log 10 d 10 pc = ( m v M v
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