Stellar Old Age

Question 1

Arises from thermal motions of ions and atoms

Answer 1

Gas pressure

Question 2

“Photon pressure” (carry momentum and exert pressure)

Answer 2

Radiation pressure

Question 3

At high densities, electron are tightly packed

Answer 3

Electron degeneracy pressure

Question 4

Mass and composition of a star specify structure

Answer 4

Vogt-Russel theorem

Question 5

Stars rich in metals

Answer 5

Population I stars

Question 6

Stars poor in metals

Answer 6

Population II stars

Question 7

Stars with no metals

Answer 7

Population III stars

Question 8

Layers above contracting helium core also heat up

Answer 8

Hydrogen shell burning

Question 9

Lots of energy released in degenerate core resulting in explosion

Answer 9

Helium flash

Question 10

“Main sequence” for Helium burning

Answer 10

Horizontal branch

Question 11

When hot degenerate core is exposed, star moves left on HR diagram

Answer 11

Planetary nebula phase

Question 12

No more energy from fusion once core is iron and star collapses

Answer 12

Supernova

Question 13

Variable stars (oscillating brightness)

Answer 13

Cepheid and Myra

Question 14

Cepheid with shorter periods

Answer 14

Classical Cepheid

Question 15

Cepheid with same period but fainter magnitude

Answer 15

Type II Cepheid

Question 16

Electron pack closer together results in increased…

Answer 16

Momentum