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lecture_tan25 - 1 2 3 4 5 6 7 8 Admin Class website...

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Admin. 3/22/11 1. Class website http://www. astro . ufl .edu/~jt/teaching/ast1002/index.html 2. Discussion sections: Tuesday 1.55pm (period 7), Bryant 3 Wednesday 10.40am (period 4), Bryant 3 Thursday 3.00pm (period 8), Bryant 3 Office hr: Thursday (5pm), Bryant 302 3. Homework 7 due Sun. Mar. 27 by 11pm (keep a record of your answers) 4. Reading: Chapters 0-11, now Chapters 12, 13 5. Email me Astro - news, jokes, tunes, images: [email protected] ufl . edu 6. Print out class notes and bring them to class - use these as a base outline to take extra notes in class. 7. Midterm 2:results will be online later this week 8. Observing Project due April 5 - complete at campus observatory on Fridays anytime between 8.30-10pm - see class website. Key Concepts: Lecture 25: Evolution and Death of Low-Mass Stars Evolution of Low-Mass Stars (like the Sun): Main Sequence (core H burning) Red Giant Planetary Nebula White Dwarf Binary Star Evolution Novae Type I supernovae The Main Sequence (MS) Stars eventually run out of nuclear fuel • Lifetime Depends on luminosity Depends on amount of fuel available Stars spend about 90% of lifetime on MS 10 Billion years for Sun 10 Million years for a 10 M sun star 10 Trillion years for a 0.1M sun star Stellar structure Equilibrium (balance) between gravity and pressure
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Evolution to Red Giant
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