Ca II H+K fluxes from S-indices of large samples: a reliable and consistent conversion based on PHOENIX model atmospheres

Context. Historic stellar activity data based on chromospheric line emission using O.C. Wilson’s S-index reach back to the 1960ies and represent a very valuable data resource both in terms of quantity and time-coverage. However, these data are not flux-calibrated and are therefore difficult to compa...

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Veröffentlicht in:	Astronomy and astrophysics (Berlin) 2013-01, Vol.549, p.1-12
Hauptverfasser:	Mittag, M., Schmitt, J. H. M. M., Schröder, K.-P.
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Conversion Emission Fluxes Historic Mathematical models Stars stars: activity stars: atmospheres stars: chromospheres stars: late-type stars: solar-type Surface chemistry
Online-Zugang:	Volltext
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