Lecture12 slides

Structure and Evolution of Stars Lecture 12 Iben 1967 1967ARA&A...5..57 HR diagram of a typical globular cluster H...

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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