CaII-M_v_ Correlation (Wilson-Bappu Effect)
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https://b2find.eudat.eu/dataset/f2bbec8e-daba-52ff-8908-43ba5227e7da
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Hipparcos parallaxes were used to derive absolute visual magnitudes of G, K, and M stars with Ca II emission line widths previously measured by O.C. Wilson. A linear...
