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Browsing by Author "Donati, J-F."
Now showing items 1-9 of 9
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Can the magnetic topology of AB Doradus be explained by a potential field distribution
Hussain, G.A.J.; Jardine, M.; Collier Cameron, A.; Barnes, J.R.; Donati, J-F. (Astronomical Society of the Pacific, 2000)We present potential magnetic field maps of the surface of the active KO dwarf, AB Dor. Maps of the surface magnetic flux distributions of rapid rotators can be produced using the technique of Zeeman Doppler imaging (ZDI). ... -
The dependence of differential rotation on temperature and rotation
Barnes, J.R.; Collier Cameron, A.; Donati, J-F.; James, D.J.; Marsden, S.C.; Petit, P. (2005)We use Doppler imaging techniques to determine the dependence of starspot rotation rates on latitude in an homogeneous sample of young, rapidly-rotating solar analogues. A solar-like differential rotation law is used, where ... -
Differential Rotation in Young Low-mass Stars
Collier Cameron, A.; Barnes, J.R.; Kitchatinov, L.; Donati, J-F. (Astronomical Society of the Pacific, 2001)Multi-line Doppler imaging methods allow us to image young, rapidly rotating stars brighter than about V = 11.5, with ~ 3 degrees surface resolution. We have recently measured the latitude dependence of the surface rotation ... -
Differential rotation on both components of the pre main-sequence binary system HD 155555
Dunstone, N.J.; Hussain, G.A.J.; Collier Cameron, A.; Marsden, S.C.; Jardine, M.; Barnes, J.R.; Ramirez Vlex, J.C.; Donati, J-F. (2008) -
Doppler images and chromospheric variability of TWA 17
Skelly, M.B.; Unruh, Y.C.; Barnes, J.R.; Lawson, W.A.; Donati, J-F.; Cameron, A.C. (2009)We present Doppler imaging and a Balmer line analysis of the weak-line T Tauri star TWA 17. Spectra were taken in 2006 with the University College London Echelle Spectrograph on the Anglo-Australian Telescope. Using ... -
Doppler images and chromospheric variability of TWA 6
Skelly, M.B.; Unruh, Y.C.; Cameron, A.C.; Barnes, J.R.; Donati, J-F.; Lawson, W.A.; Carter, B.D. (2008) -
Hubble Space Telescope observations of SV Cam - I. The importance of unresolved star-spot distributions in light-curve fitting
Jeffers, S.V.; Barnes, J.R.; Collier Cameron, A.; Donati, J-F. (2006) -
Starspot coverage and differential rotation on PZ Tel
Barnes, J.R.; Collier Cameron, A.; James, D.J.; Watson, C.A.; Vincent, F.; Donati, J-F. (Astronomical Society of the Pacific, 2000)We present Doppler images of the young, late-type star, PZ Tel from spectroscopic observations at two epochs. The 0.95d period necessitated dual-site observations in order to obtain full phase coverage. By making use of ... -
The surprising magnetic topology of t Sco: fossil remnant or dynamo output
Donati, J-F.; Howarth, I.D.; Jardine, M.; Petit, P.; Catala, C.; Landstreet, J.D.; Bouret, J-C.; Alecian, E.; Barnes, J.R.; Forveille, T.; Paletou, F.; Manset, N. (2006)