IUE observations of the chromospheric activity-age relation in young solar-type stars

Astronomy and Astrophysics – Astronomy

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Chromosphere, Late Stars, Stellar Evolution, Ultraviolet Astronomy, Ultraviolet Spectra, Early Stars, Emission Spectra, Iue, Solar Activity

Scientific paper

Ultraviolet data obtained with the IUE spacecraft are presented for a dozen solar-type stars in the field. The stars are of spectral type F6 V - G1 V; on the basis of their high Li content, they range in age from 0.1 to 2.8 Gyr. The evolution of transition regions and chromospheric emission with stellar age is studied along with the surface distribution of magnetically active regions as revealed by rotational modulation of UV emission line fluxes.

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