Lecture11

Lecture11 - First Exam Tuesday March 9 5:00 pm 6:20 pm...

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First Exam Tuesday March 9 5:00 pm – 6:20 pm Physics Lecture Hall Closed book and notes Computer-graded multiple-choice questions Material covered: Text chapters 16 - 22 Lectures 1-14 (January 19 through March 4) Bring Student ID card and a #2 pencil Practice Exam on class web page (soon) All necessary equations and constants will be given
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Extra Credit Write 2 questions for the mid-term exam multiple-choice with 5 answers cover material of mid-term exam accepted questions will receive 1 perfect homework assignment score submit as many questions as you like, but only 1 10-point credit will be given Deadline: 5 pm Monday March 1 early submission encouraged Send questions via e-mail
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Previous Lecture Horizontal Branch Stars – H shell, He core AGB stars – H and He fusing shells Planetary Nebulae Novae – H fusion on surface of WD mass transfer in binary system High mass stellar evolution He fusion to carbon alpha capture reactions multiple shell fusion sources
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Equilibrium Process Reactions Around 3 x 10 9 K, reactions between alpha capture products occur: 12 C+ 16 O Æ 24 Mg + 4 He or Æ 26 Mg + 2 H or Æ 27 Si + n Many possible competing reactions Quickly establish equilibrium Produce all elements up to 56 Fe
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Nucleosynthesis Beta decay (n Æ p + e + ν ) and proton capture produce odd-number nuclei Non-alpha capture elements much less abundant 4x most abundant
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Lecture11 - First Exam Tuesday March 9 5:00 pm 6:20 pm...

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