evo: IMS

Question 1

LMS, IMS identify by zone

Answer 1

LMS: conv env

IMS: rad env

Question 2

summarise all steps? what’s burning?

Answer 2

A-- B \_\_\_\_ MS \_\_\_\_ 
B--C \_\_\_\_  MS \_\_\_\_ H-->0
C--D \_\_\_\_ H-->He shell
D \_\_\_\_ dredge up
D--E \_\_\_\_ RED GIANT
E \_\_\_\_ He burn
EFGH \_\_\_\_ blueloop-- (blueward-- const He core burn, redward:He burn in core dec)
H--J \_\_\_\_ AGB \_\_\_\_ stable He burn (He shell burn)

Question 3

how dow we know if shell is burning?

Answer 3

core and envelope change in opposite directions:

an expansion of the layers above the shell source & a contraction of the layers below

Question 4

effect of shell burn???
core contract & shell expand,
effect on core??

Answer 4

core T inc, He ignite (10^8K)

Question 5

at what point He ignite?

Answer 5

E

Question 6

at C: if rad of env inc, then why T ~ cont?

Answer 6

coz fast KH timescale

Question 7

why IMS don’t have degenerate core? LMS have

Answer 7

LMS denser core

Question 8

at D its called? why

Answer 8

red giant, the expansion of env made it huge, red giant

Question 9

Hertzsprung gap? point on the dig

Answer 9

area between main sequence and red giants with a striking deficiency of observed stars

coz the expansion was on KH timescale

Question 10

at what point core reach SC limit?

Answer 10

D

Question 11

identify dredge up in kip dig?

Answer 11

when convenient reaches core (see kip dig)