Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....68...69g&link_type=abstract
Astronomy and Astrophysics, vol. 68, no. 1-2, Aug. 1978, p. 69-74.
Astronomy and Astrophysics
Astrophysics
16
Chromosphere, K Lines, Line Shape, Stellar Atmospheres, Stellar Magnitude, Spectral Line Width, Statistical Analysis, Stellar Luminosity
Scientific paper
The Wilson-Bappu linear relation between absolute visual magnitude and the logarithm of corrected Ca II K emission-line width is examined to determine whether other observables, such as the intensity of the K-line emission or color temperature, can affect that relation. A statistical analysis is performed using a sample of 284 late-type stars with good trigonometric parallaxes, reduced to a common system of values for the logarithm of corrected Ca II K emission-line width and K-line emission intensity. The results show that the Wilson-Bappu relation is linear, that its calibration is accurate, and that a correction factor must be introduced because of the intensity of the K reversal. It is found that this correction may be as large as 2 magnitudes. The intensity effect in the Wilson-Bappu relation is interpreted as a simple geometrical overlap of the absorption and emission K-line profiles.
Glebocki R.
Stawikowski Antoni
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