17_Post_Main_Sequa - 17 – Post Main Sequence Hans Bethe at 98 and still working Hans gets his Nobel 2 The Plan • A star leaves the MS when ~10

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Unformatted text preview: 17 – Post Main Sequence Hans Bethe at 98 and still working! Hans gets his Nobel 2 The Plan • A star leaves the MS when ~10% of its H has been burned to He. First the star expands because the fire is getting closer to the surface and the volume of the star that has sustained thermonuclear reactions is increasing. • But there is a limit to the temperature on the lower side. • Rather than reducing its luminosity, the star increases its luminosity and size! 3 Red Giant Branch 4 Horizontal Branch 5 Asymptotic Giant Branch 6 The Whole Post Main Sequence Trip 7 Formation of the Elements 0 1 2 3 4 5 6 7 8 9 10 111213 14 1516 17181920 2122 2324 25262728 2930 3132 33343536 37383940 41 424344 45464748 4950 5152 53 5455 56 5758 59 H (1) He (2) Li (3) Be (4) B (5) C (6) N (7) O (8) F (9) Ne (10) Na (11) Mg (12) Al (13) Si (14) P (15) S (16) Cl (17) Ar (18) K (19) Ca (20) Sc (21) Ti (22) V (23) Cr (24) Mn (25) Fe (26) Co (27) Ni (28) Cu (29) Zn (30) Ga (31) Ge (32) As (33) Se (34) Br (35) Kr (36)...
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This note was uploaded on 04/05/2009 for the course ASTRO 3332 taught by Professor Houck,j during the Spring '09 term at Cornell University (Engineering School).

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17_Post_Main_Sequa - 17 – Post Main Sequence Hans Bethe at 98 and still working Hans gets his Nobel 2 The Plan • A star leaves the MS when ~10

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