Other
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.217...41d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 217, Nov. 1, 1985, p. 41-53.
Other
6
Chromosphere, H Lines, K Lines, Stellar Activity, Stellar Spectra, Ultraviolet Spectra, Emission Spectra, Faculae, G Stars, Iue, Radiant Flux Density, Stellar Color
Scientific paper
IUE measurements of Mg II h and k emission fluxes are presented for 30 F and G stars that are on or near the main sequence and compared with Wilson's measurements of the Ca II H and K fluxes in these stars. The survey includes a large proportion of stars with very low chromospheric activity as well as 111 Tau, χ1Ori and other examples of strong chromospheric emission. Emission cores are present in all of the stars observed. A sharp lower limit to the flux in the cores of the k lines implies the existence of a minimum level of chromospheric activity in which the k line flux is a constant fraction of stellar luminosity. Reduction of Wilson's values to absolute fluxes produces a close correlation between Mg and Ca strength with possibly some dependence on colour. For the most active stars, the Mg k and Ca fluxes are consistent with the presence of solar plages covering up to one half of the stellar surface.
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