Burning Stage | Lγ(W) |
Lν(W) |
Temperature(K) |
Radius(km) |
Time |
|---|---|---|---|---|---|
hydrogen==>helium |
3.1x1031 |
.... |
39,800 |
4.2 million |
7.4 million years |
helium===>C,O |
9.5x1031 |
7.3x1027 |
15,800 |
47 million |
680,000 years |
carbon===>Ne,Na |
1.2x1032 |
1033 |
4,360 |
670 million |
170 years |
neon===>O(??) |
1.2x1032 |
7.8x1035 |
4,360 |
670 million |
1.3 years |
oxygen===>Si,P,S |
1.2x1032 |
2.3x1036 |
4,360 |
670 million |
0.52 years |
silicon==>Fe-peak |
1.2x1032 |
3.8x1038 |
4,360 |
670 million |
1.4 days |
collapse |
1.2x1032 |
8.1x1041 |
4,360 |
670 million |
0.35 seconds |
Note that after the onset of carbon burning, the Luminosity, Radius, and Temperature of the star do not change ===> we cannot tell (from visual observations) in what stage of nuclear burning the star sits. Carbon burning 170 years. The stages after carbon burning take around 1 year!