Wilson-Bappu effect
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In 1957 Olin C. Wilson and M. K. Vainu Bappu reported on the remarkable correlation between the measured width of the emission feature at the center of the Ca II K line and the absolute visual magnitude of the star. This is known as the Wilson-Bappu effect. The correlation is independent of spectral type and applicable to stars of type G, K, and M. This method is one of several methods used in the Extragalactic Distance Scale.
[edit] References
- Wilson, O. C.; Vainu Bappu, M. K. (1957), "H and K Emission in Late-Type Stars: Dependence of Line Width on Luminosity and Related Topics", Astrophysical Journal,125,661
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