Calculateur de Couleur-Température Stellaire — Formule
Star Colour and Temperature
A star's colour is determined by its surface temperature. Hotter stars appear blue-white; cooler stars appear orange-red.
Peak Wavelength (Wien's Law)
lambda_max = 2.8978e6 / T (nm)
Approximate B-V from Temperature
B-V ≈ -3.684 log10(T) + 14.551
This empirical fit works reasonably for main-sequence stars between 3000 and 30 000 K.
Exemple Résolu
A blue star at 10 000 K.
- Peak = 2 897 800 / 10000 = 289.8 nm (ultraviolet)
- B-V ≈ -3.684 × log10(10000) + 14.551
- = -3.684 × 4 + 14.551 = -0.185
- Negative B-V: more blue than visual light, appears blue-white.