Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..108..611l&link_type=abstract
Astronomy and Astrophysics Suppl. 108, 611-619 (1994)
Astronomy and Astrophysics
Astrophysics
5
Stars: Chromospheres, Stars: Activity, Catalogs
Scientific paper
The so-called Wilson-Bappu relationship (hereinafter W-B) is an empirical linear relation established in 1957. Formally simple, this relation links two observable parameters of a star: the CaII K line core emission width with the absolute magnitude of the star having chromospheric activity. Other Luminosity/Emission-width relationships were established on the basis of other chromospheric lines like MgII (2795.5A and 2802.7A) and Lyα (1215.9A). All these resonance lines are used as a diagnostic of physical properties of stellar chromospheres. We have reanalysed all the available data connected with the CaII K and the MgII k line widths in the literature from 1957 until today to be able to prepare a database containing all the essential information needed to study and to understand empirical stellar activity relationships.
Freire Ferrero R.
Lastennet Erwan
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