Table 16-2: A Theoretical Model of the Sun

Distance from the Sun’s center (solar radii)	Fraction of luminosity	Fraction of of mass	Temperature (× 10⁶ K)	Density (kg/m³)	Pressure relative to pressure at center
0.0	0.00	0.00	15.5	160,000	1.00
0.1	0.42	0.07	13.0	90,000	0.46
0.2	0.94	0.35	9.5	40,000	0.15
0.3	1.00	0.64	6.7	13,000	0.04
0.4	1.00	0.85	4.8	4,000	0.007
0.5	1.00	0.94	3.4	1,000	0.001
0.6	1.00	0.98	2.2	400	0.0003
0.7	1.00	0.99	1.2	80	4 × 10⁻⁵
0.8	1.00	1.00	0.7	20	5 × 10⁻⁶
0.9	1.00	1.00	0.3	2	3 × 10⁻⁷
1.0	1.00	1.00	0.006	0.00030	4 × 10⁻¹³
Note: The distance from the Sun’s center is expressed as a fraction of the Sun’s radius (R_⊙). Thus, 0.0 is at the center of the Sun and 1.0 is at the surface. The fraction of luminosity is that portion of the Sun’s total luminosity produced within each distance from the center; this is equal to 1.00 for distances of 0.25 R_⊙ or more, which means that all of the Sun’s nuclear reactions occur within 0.25 solar radius from the Sun’s center. The fraction of mass is that portion of the Sun’s total mass lying within each distance from the Sun’s center. The pressure is expressed as a fraction of the pressure at the center of the Sun.