This question is about stars and their radiation. (The Stefan-Boltzmann constant is σ=5.67×10−8 W m−2 K−4\sigma = 5.67 \times 10^{-8} \text{ W m}^{-2} \text{ K}^{-4}σ=5.67×10−8 W m−2 K−4.)
Use the data below to show that the luminosity of the star Altair is about 3.2×1027 W3.2 \times 10^{27} \text{ W}3.2×1027 W.
Spica A, a massive binary star component, has a luminosity 3800 times greater than that of Altair. It has a diameter 4.7 times greater than that of Altair.
Calculate the surface temperature TTT of Spica A.
