consider two ZAMS stars: 09 and B0. The effective temperature ( temperature at the photosphere ) of the 09 star is 34,500 k; Te of the B0 star is 30,900 K.
(a) Calculate the peak wavelength of the blackbody spectra of both stars.
(b) Calculate the energy in eV of the photons corresponding to the peak wavelength. Can these photons ionize hydrogen in the ground state?
(c) Obtain the ratio between the number of ionizing photons produced by an O9 star and a B0 star?
(d) Assuming a hydrogen density of 10^8 m^-3, and Alpha = 3.1 x 10^-19 m^3 s^-1, estimate the Stromgren radius of the stars in pc and AU.