An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Wilson-Bappu effect
  اسکر ِ ویلسون-باپو  
oskar-e Wilson-Bappu
Fr.: effet de Wilson-Bappu  

The strong correlation between the equivalent width of Ca II → H and K lines of a late-type giant or supergiant star with the absolute visual magnitude of the star.

See also: O. C. Wilson & M. K. Vainu Bappu (1957, ApJ 125, 661); → effect.