The CaII-M_v Correlation (Wilson-Bappu Effect) Calibrated by HIPPARCOS Parallaxes

Details The CaII-M_v Correlation (Wilson-Bappu Effect) Calibrated by HIPPARCOS Parallaxes The CaII-M_v Correlation (Wilson-Bappu Effect) Calibrated by HIPPARCOS Parallaxes

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasp..111..335w&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 757, pp. 335-341.

Astronomy and Astrophysics

Astronomy

8

Stars: Chromospheres, Stars: Distances, Stars: Fundamental Parameters

Scientific paper

We have used Hipparcos parallaxes 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 relationship similar to the one derived originally by Wilson & Bappu and improved by Lutz & Kelker was found from M_v=+7 to -2. For stars brighter than M_v=-2 a substantial number of stars show Ca II emission lines that are broader than expected from the linear fit. Most of those stars are bright giants and supergiants of type G. In appendices we show some sample Ca II profiles and identify emission lines of Fe II as well as the Hepsilon line in some stars.

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