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- W2063670300 abstract "Surface brightness maps for the young K0 dwarf AB Doradus are reconstructed from archival data sets for epochs spanning from 1988 to 1994. By using the signal-to-noise ratio enhancement technique of least-squares deconvolution, our results show a greatly increased resolution of spot features than obtained in previously published surface brightness reconstructions. These images show that for the exception of epoch 1988.96, the star-spot distributions are dominated by a long-lived polar cap, and short-lived low to high-latitude features. The fragmented polar cap at epoch 1988.96 could indicate a change in the nature of the dynamo in the star. For the first time we measure differential rotation for epochs with sufficient phase coverage (1992.05, 1993.89, 1994.87). These measurements show variations on a time-scale of at least 1 year, with the strongest surface differential rotation ever measured for AB Dor occurring in 1994.86. In conjunction with previous investigations, our results represent the first long-term analysis of the temporal evolution of differential rotation on active stars." @default.
- W2063670300 created "2016-06-24" @default.
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- W2063670300 date "2007-02-21" @default.
- W2063670300 modified "2023-10-16" @default.
- W2063670300 title "Magnetic activity on AB Doradus: temporal evolution of star-spots and differential rotation from 1988 to 1994" @default.
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- W2063670300 doi "https://doi.org/10.1111/j.1365-2966.2006.11154.x" @default.
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