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lec27 - Lecture 27 Evolution of Stars Post-Giants Lecture...

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Lecture 27 Evolution of Stars: Post-Giants Purdue University, Astronomy 364 1 Lecture 27
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Reminder There will be no class on Apr 4 and 6. HW07 has been posted. Note the due date. Exam #2 can be picked up from Rm 144. Exam statistics: – Mean: 81.0 – Median: 83.0 – Standard deviation: 11.0 – Range: 57-100 – Distribution: 90-100: 10; 80-90: 11; 70-80: 10; 60-70: 5; 50-60: 1; 0: 3 Lecture 27 Purdue University, Astronomy 364 2
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Review Lecture 27 Purdue University, Astronomy 364 3
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AGB stars High mass-loss rates, and cool effective temperatures (~3000 K) A dust shell hides most of the stellar luminosity and so the stars are seen only in the infrared. Lecture 27 4 Purdue University, Astronomy 364
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Mass loss Mass loss driven by the high luminosity and thermal pulses. – As mass decreases, and luminosity increases, the mass loss rate increases. • High-resolution radio image of mass-loss from an AGB star, TX Cam Lecture 27 5 Purdue University, Astronomy 364
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Post-AGB phase The cloud expands and becomes optically thin.
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