主序星寿命计算器
使用此主序星寿命计算器快速获得准确的计算结果。
Main-Sequence Lifetime
10,000,000,000 yr
Main-Sequence Lifetime vs Stellar Mass
公式
## Main-Sequence Lifetime More massive stars burn through their hydrogen fuel much faster because luminosity rises steeply with mass. ### Approximate Formula **t ≈ 10¹⁰ × (M/M_sun)^(-2.5) years** This comes from t ∝ M/L and the mass-luminosity relation L ∝ M^3.5 for main-sequence stars.
计算示例
A star with 2 solar masses.
- 01t = 10^10 × 2^(-2.5)
- 022^(-2.5) = 1/√(2^5) = 1/√32 = 0.1768
- 03t = 10^10 × 0.1768 ≈ 1.77 Gyr
- 04About 1.77 billion years on the main sequence.
常见问题
How long will the Sun remain on the main sequence?
About 10 billion years total. It is currently about 4.6 billion years into its main-sequence life.
Why do massive stars die so quickly?
Luminosity scales roughly as M^3.5, so a 10-solar-mass star is over 3000 times as luminous but only has 10 times the fuel. It runs out in about 30 million years.
What happens after the main sequence?
Stars expand into red giants (or supergiants for massive stars), then end as white dwarfs, neutron stars, or black holes depending on mass.