Star expansion

  • Thread starter Maria76
  • Start date
  • #1
14
0

Main Question or Discussion Point

Hi,

When the core of a star shrinks during its evolution, does it always lead to the expansion of the star? If not, why? What cases would cause it to expand?

Thanks in advance,
Maria
 

Answers and Replies

  • #2
181
0
No, sometimes gravity from the mass of the star overcomes the energy from core fusion to shrink the star into a white dwarf about the volume of the Earth (which is held up by electron degeneracy) or a neutron star about the diameter of a city (which is held up by neutron degeneracy) or it collapses to a black hole.

http://imagine.gsfc.nasa.gov/docs/science/know_l2/dwarfs.html
http://imagine.gsfc.nasa.gov/docs/science/know_l1/neutron_stars.html
http://imagine.gsfc.nasa.gov/docs/science/know_l2/black_holes.html

One case that causes it to expand is when the core fuses helium into carbon.

http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/971016.html

Arthur Eddington used the Hertzsprung-Russell diagram to demonstrate stellar physics.
http://en.wikipedia.org/wiki/Hertzsprung-Russell_diagram
 

Related Threads for: Star expansion

  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
7
Views
1K
  • Last Post
Replies
4
Views
2K
  • Last Post
2
Replies
30
Views
5K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
10
Views
3K
  • Last Post
Replies
0
Views
2K
Top