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(a) An astronomer obtains the spectrum of a white dwarf star, and determines that it peaks in the ultraviolet at = 150 nm, similar to the spectra of...

(a) An astronomer obtains the spectrum of a white dwarf star, and determines that it peaks in the ultraviolet at λ = 150 nm, similar to the spectra of very luminous main-sequence stars. What is the surface temperature of the white dwarf?

(b) At the same time, the astronomer determines that the intrinsic luminosity of the white dwarf is only LW D = 0.01L⊙ (i.e. 1% of the luminosity of the Sun). As discussed in class, the luminosity and temperature of a star can be used to infer its radius. What is the radius of the white dwarf star? Express your answer in terms of the radius of the Sun, R⊙, and the radius of the earth, R⊕. (i.e., how many solar [Earth] radii is this? Or, on the other hand, what fraction of the solar [Earth] radius is this?) 

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Part (a) the surface temperature of the white dwarf =... View the full answer

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a) surface temperature of the white dwarf = 19333.3 K b) radius of white... View the full answer

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