Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-09
Mon.Not.Roy.Astron.Soc.375:567-583,2007
Astronomy and Astrophysics
Astrophysics
accepted by MNRAS 18 pages 18 figures
Scientific paper
10.1111/j.1365-2966.2006.11154.x
Surface brightness maps for the young K0 dwarf AB Doradus are reconstructed from archival data sets for epochs spanning 1988 to 1994. By using the signal-to-noise 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 starspot 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 timescale of at least one 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.
Collier Cameron Andrew
Donati Jean-Francois
Jeffers Sandra V.
No associations
LandOfFree
Magnetic activity on AB Doradus: Temporal evolution of starspots and differential rotation from 1988 to 1994 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetic activity on AB Doradus: Temporal evolution of starspots and differential rotation from 1988 to 1994, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic activity on AB Doradus: Temporal evolution of starspots and differential rotation from 1988 to 1994 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-437099