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| Paper: |
Differential Rotation and Magnetic Polarity Patterns on AB Doradus |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
1966 |
| Authors: |
Donati, J.-F.; Collier Cameron, A.; Hussain, G. A. J.; Semel, M. |
| Abstract: |
We report new Zeeman-Doppler imaging observations of the rapidly rotating young K0 dwarf AB Doradus, obtained with the Anglo-Australian Telescope in 1996 December. We show simultaneous brightness and magnetic images of the stellar photosphere, reconstructed at three different epochs over the course of a seven-night observing run. Latitude-by-latitude cross-correlation of the resulting images confirms the form and amplitude of the surface differential pattern found in the previous year's observations by Donati & Cameron (1997), with the pole rotating slower than the equator by about one part in 220. We also present dynamic spectra showing the distribution of H alpha-absorbing clouds in the stellar corona at the same epoch. |
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