Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.279s&link_type=abstract
In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 279-282 (SEE N89-10682 01-89)
Astronomy and Astrophysics
Astronomy
1
Cool Stars, Dwarf Stars, Iue, Spaceborne Astronomy, Stellar Rotation, Ultraviolet Astronomy, Ultraviolet Spectra, Chromosphere, Stellar Activity, Time Dependence
Scientific paper
Low-resolution Mg II spectra were obtained with the IUE for rapidly rotating, spotted K dwarf stars in the Pleiades cluster. The observations show an order of magnitude spread in the chromospheric emission of presumably coeval members of the cluster. The emission is correlated with the stellar rotation rate, being strongest for stars having periods of less than 1 day and weakest for more slowly rotating stars. The strength of the emission of the rapid rotators lies well above the emission levels that characterize the most active solar-type stars in the field and is significant stronger than the Mg II emission observed for low-mass pre-main sequence stars. The observations indicate that the decay of stellar chromospheric activity with age does not follow any simple rule, such as the square-root law or an exponential decay law.
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