# 恆星

(已重新導向自 恆星)

## 測量的單位

 太陽質量： $\begin{smallmatrix}M_\odot = 1.9891 \times 10^{30}\end{smallmatrix}$公斤[27] 太陽光度： $\begin{smallmatrix}L_\odot = 3.827 \times 10^{26}\end{smallmatrix}$ 瓦特[27] 太陽半徑： $\begin{smallmatrix}R_\odot = 6.960 \times 10^{8}\end{smallmatrix}$ 米[28]

## 輻射

### 星等

0 4
1 15
2 48
3 171
4 513
5 1,602
6 4,800
7 14,000

$\Delta{m} = m_f - m_b$
$2.512^{\Delta{m}} =$ 光度差

## 分類

[98]

O 33,000 K or更高 弧矢增二十二
B 10,500–30,000 K 參宿七
A 7,500–10,000 K 牛郎星
F 6,000–7,200 K 南河三A
G 5,500–6,000 K 太陽
K 4,000–5,250 K 印第安座ε星
M 2,600–3,850 K 半人馬座比鄰星

## 核融合反應路徑

41H → 22H + 2e+ + 2νe（4.0 MeV + 1.0 MeV）
21H + 22H → 23He + 2γ (5.5 MeV)
23He → 4He + 21H (12.9 MeV)

41H → 4He + 2e+ + 2γ + 2νe (26.7 MeV)

0.01
0.4
4
8

4He + 4He + 92 keV → 8*Be
4He + 8*Be + 67 keV → 12*C
12*C → 12C + γ + 7.4 MeV

34He → 12C + γ + 7.2 MeV

（百萬K）

(kg/cm³)

（以年為單位）
37 0.0045 810萬
188 0.97 120萬
870 170 976
1,570 3,100 0.6
1,980 5,550 1.25

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