Estimate the ideal gas and radiation pressure (in n/m 2 ) at the center of the white dwarf sirius b, using 3×10 7 k for the core temperature. compare these values with the estimated core pressure given by p core ≈ 23 πgrho 2 r 2 . hint: when calculating the (ideal) gas pressure, consider sirius b to be made of pure (fully ionized) carbon-12. you can use the average mass density of ∼3×10 9 kg/m 3 . (b.) given what you found in part (a), what fraction of the total pressure in the core is likely to have to be from electron-degeneracy pressure (as opposed to gas and radiation pressure)?