Lecture 27. Stellar Evolution

Lecture 27. Stellar Evolution

A. Class Business

  1. 1.5 activities this afternoon!

  2. Reading for Mon. (about 30 pp.):
    1. Sec. 22.3
    2. Pref. to Ch. 23, Secs. 23.1, 23.2, 23.3, 23.5
    3. Pref. to Ch. 24, Sec. 24.1
    4. Pref. to Ch. 25, Secs. 25.1 & 25.5

  3. STAR PARTY Friday, 7/30, 10:00 p.m., Museum of Rockies

  4. turn in OUT-OF-CLASS ACTIVITY papers next MONDAY, 8/2

  5. Homework: pick up #6. this p.m. Questions on #5?

  6. Info. on Final --
    • 1/2 since Exam 2, 1/2 on Exam 1 & 2 material
    • scoring bonus:
        will multiply points missed on Exams 1 & 2 by fraction you get right on Exam 3, and add result to your score
    • coverage will prob'ly be through Wed.'s material!
    • review time TBD



B. Stellar Birth

Q: HOW DO STARS BEGIN THEIR LIVES?

C. Stellar Lifecycles

Q: HOW DO DIFFERENT STARS EVOLVE?

MASS (in solar masses)
sub-solar (< 1)
solar (1 - 5)
massive (5 - 25)
supermassive (> 25)
spec. class
M/K
G/F/A
B
O
time on MS
200/10 byr.
10/3/.5 byr
10 myr
1 myr

D. Stellar Death

Q: WHAT DOES IT MEAN FOR A STAR TO DIE?

Q: HOW DOES A STAR MEET SUCH AN END?







E. Star Clusters
object
globular cluster
open cluster
O-B assoc.
# of objects
200 in MW
1000's in MW
1000's in MW
stars' #/type
104-6/red
~100's/red & blue
5-50/ blue
where in MW
halo & center
disk
spiral arms
age/stars' color
very old/red
still forming/red & blue
still forming/blue
examples
APOD list*
APOD list*
ROSAT image*


IMPORTANT POINTS:

F. Miscellaneous