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White dwarf magazine 310 pdf4/17/2023 ![]() Our analysis constitutes what is the most complete spectroscopic survey of any white dwarf. The two results obtained are: dalpha/alpha = 6.77 +/- X 10^$. ![]() We have measured the fine structure constant, alpha, at the white dwarf surface, used a newly calibrated Hubble Space Telescope STIS spectrum of G191-B2B, two new independent sets of laboratory Fe V wavelength measurements, and new atomic calculations of the sensitivity parameters that quantify Fe V wavelength dependency on alpha. Numerous photospheric absorption features are detected, making this a suitable environment to test theories in which the fundamental constants depend on gravity. The gravitational potential phi = GM/Rc^2 at the surface of the white dwarf G191-B2B is 10,000 times stronger than that at the Earth's surface.
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