after evolution Flashcards
1
Q
identify red n blue horizontal sub giant stars on hr dig
A
f
2
Q
spectral type of Red HB
A
K G
3
Q
spectral type BlueHB
A
A B
4
Q
what’s extreme HB
A
v thin shell subdwarfs
type O B
thin H shell
5
Q
helium content in sdB?
A
b type sub dwarf (extreme horizontal branch)
solar He content
6
Q
helium content in sdO
A
v. high
7
Q
AGB burning
A
CO core
He burn shell
H burn env
8
Q
identify AGB?
A
core He ~ 0
9
Q
AGB thermal pulses caused by?
A
when the ashes of H burning shell increase the mass of the He burning shell
10
Q
early AGB
A
shell expands coz burning
H burning stops
CO core mass inc, becomes degenerate
11
Q
composition n burning in HB vs AGB?
A
HB: stable He core
H shell
AGB: CO core He shell burn H shell burn H env
