observable properties of stars |
Table 1: | Six fundamental properties of stars, how they are determined from observation and the range in their values. |
property |
determined from |
range of values |
mass (M_{s})^{ } |
binary stars^{ } or g (spectrum) and R_{s} |
10^{-1} M_{} < ^{ }M_{s} < 50 M_{}^{ } |
luminosity (L_{s})^{ } |
apparent magnitude and distance^{ } or spectrum (luminosity class) |
10^{-4} L_{} < ^{ }L_{s} < 10^{6} L_{}^{ } |
radius (r_{s})^{ } |
L_{s}, T_{e}
[L_{s} = 4r_{s}^{2}
T_{e}^{4}] or interferometry (angular diameter) and distance or eclipsing binary stars |
10^{-2} r_{} < ^{ }r_{s} < 10^{3} r_{}^{ } |
effective temperature (T_{e})^{ } |
continuous spectrum^{ } or spectral type |
2 × 10^{3} K < ^{ }T_{e} < 10^{5} K |
age^{ } | star clusters and theory^{ } | 0 - 10^{10} y |
chemical composition (X, Y, Z)^{ } | line spectrum^{ } |
X_{}=0.747^{ } Y_{}=0.236^{ } Z_{}=0.017^{ } |