VbvAstE-001

The plasma inside the core has the constant density
and constant temperature
n ⋆ = 16 Z 3
≈ 1.2 · 10 24 Z 3 cm −3 (6.27)
9π a 3 B
( ) 1/3 ( )
25 · 13 c
T ⋆ =
Z ≈ Z · 2.13 · 10 7 K. (6.28)
28π 4 ka B
The plasma density and its temperature are decreasing at an approaching to the
stellar surface:
( ) 6 R⋆
n e(r) = n ⋆ (6.29)
r
and
( ) 4 R⋆
T r = T ⋆ . (6.30)
r
The external radius of the star is determined as
( √απ )
A 1/2
Z
R 0 =
mp
6.44 · 1011
R ⋆ ≈ cm (6.31)
2η m e Z(A/Z)
1/2
and the temperature on the stellar surface is equal to
( ) 4 R⋆
T 0 = T ⋆ ≈ 4.92 · 10 5 Z
(6.32)
R 0 (A/Z) 2
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