SIMBAD references

2001PASP..113..188P - Publ. Astron. Soc. Pac., 113, 188-194 (2001/February-0)

A large spectral class dependence of the Wilson-Bappu effect among luminous stars.

PARSONS S.B.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Spectroscopic - Stars: Chromospheres - Stars: Distances - Stars: Fundamental Parameters - Stars: Late-Type - Stars: Supergiants

Simbad objects: 24

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2021.03.07-16:42:20

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