Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasp..113..188p&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 113, Issue 780, pp. 188-194.
Astronomy and Astrophysics
Astronomy
2
Stars: Binaries: Spectroscopic, Stars: Chromospheres, Stars: Distances, Stars: Fundamental Parameters, Stars: Late-Type, Stars: Supergiants
Scientific paper
The striking correlation between Ca II K-line emission width and absolute visual magnitude has not previously been well calibrated for stars more luminous than giants. From a sample of binary systems fit to isochrones, we find deviations of more than 2 mag, correlated with spectral class, between these binarity Mv values and the Wilson-Bappu relation. Additional Mv values derived from Hipparcos parallaxes are used to explore the systematics. The spectral class dependence vanishes for K-line parameter logW0<=1.80. Linear spectral class corrections are derived for the more luminous stars, with logW0>=2.00, while a table is provided for the transition region. The dispersion from these relations is about +/-0.6 mag. This recalibration extends the demonstrated applicability of the Wilson-Bappu technique to Mv~=-5 or distance ~20 kpc.
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