Structure and Evolution of Stars Lecture 12
Iben 1967
1967ARA&A...5..57
HR diagram of a typical globular cluster
Horizontal branch
AGB AGB Red giant branch Turn-off point
Blue stragglers
Main Sequence
White dwarfs
"#$%&$'!()$*+,!-*!.-/,!01!2&*
!
! !"#$%&'$()*+,-.)/$0'$12)+.)/$3'$,"--.)
low mass
0 2 3.6 5 6.2 7.5
1 M¯ , age 0, 2.0, 3.6, 5.0, 6.2, 7.5, 9.6, 11.0, 11.6 Gyr
9.6
11
11.6 Gyr
Iben 1967
1967ARA&A...5..57
high mass 0.00 0.15
0.31 0.40 0.44
2.5 M¯ , age 0, 0.15, 0.31, 0.40, 0.44, 0.46 and 0.48 Gyr 0.46 0.48 Gyr
20
4
Figure 9.9. R diagram du ing for stars belled (in M X = 0.7, Z = of each track the evolution haustion; the is terminated thin dotted li show the loca with accurate ity and radius bol correspon masses, as ind ner (mass val
log (L / Lsun)
10 5
2
3 2 1.5
0
!2
<0.8, 2!3, >20 0.8!1, 3!5 1!1.5, 5!10 1.5!2, 10!20
4.5
1 0.8
4.0 log Teff (K)
3.5
The Mirror Principle of Shell-Burning Stars
Area : ∆A = ∆px ∆x = h
px
Only two electrons permitted in
area ∆A = h
x
Iben 1967
1967ARA&A...5..57
Chabrier & Baraffe 2000