Magnetic structure in cool stars. VII - Absolute surface flux in CA II H and K line cores

Astronomy and Astrophysics – Astrophysics

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Calcium, Cool Stars, H Lines, K Lines, Late Stars, Magnetic Flux, Stellar Spectra, Magnetic Measurement, Stellar Activity, Stellar Cores, Stellar Structure, Stellar Temperature

Scientific paper

Middlekoop's (1982) conversion of the relative Ca II H and K line-core intensity index determined with the Ca II H and K photometer at Mt. Wilson is revised into the line-core flux per unit area at the stellar surface. The conversion factor is now established for stars ranging in luminosity class from V to II-III and in color from B - V = 0.3 to B - V = 1.6. A calibration of the stellar surface-flux units is derived by means of the solar flux spectrum. These results are compared with other absolute flux determinations, and the influence of the pass band on the detected Ca II line-core flux is investigated. The Ca II line-core surface flux exhibits a color-dependent minimum which differs between main-sequence stars and giants. There is no conspicuous dependence of the minimal Ca II H and K flux on metallicity.

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