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Wilson-Bappu effect

   Also found in: Wikipedia 0.04 sec.
Wilson-Bappu effect [′wil·sən ′bä·pü i‚fekt]
(astronomy)
A linear relation between the absolute magnitudes of late-type stars and the width of the K2emission core in the resonance line of ionized calcium (CaII) at a wavelength of 3933 nanometers.


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