Lec20 - Lecture 20 Stellar Interior Purdue University Astronomy 364 1 Lecture 20 Stellar Evolution Lecture 20 Purdue University Astronomy 364 2 H-R

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Unformatted text preview: Lecture 20 Stellar Interior Purdue University, Astronomy 364 1 Lecture 20 Stellar Evolution Lecture 20 Purdue University, Astronomy 364 2 H-R Diagram for Clusters Lecture 19 Purdue University, Astronomy 364 3 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 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 Lecture 20 Purdue University, Astronomy 364 6 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...
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This note was uploaded on 04/23/2011 for the course ASTR 364 taught by Professor Cui,weik. during the Spring '11 term at Purdue University-West Lafayette.

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Lec20 - Lecture 20 Stellar Interior Purdue University Astronomy 364 1 Lecture 20 Stellar Evolution Lecture 20 Purdue University Astronomy 364 2 H-R

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