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Testing magnetically confined wind shock models for Beta Cep using XMM-Newton and Chandra phase-resolved X-ray observations
F. Favata, C. Neiner, P. Testa +2
(abridged) We have performed a set of phase-resolved X-ray observations of the magnetic B star Beta Cep, for which theoretical models predict the presence of a confined wind emitti…
Differential rotation on both components of the pre main-sequence binary system HD 155555
N. J. Dunstone, G. A. J. Hussain, A. Collier Cameron +5
We present the first measurements of surface differential rotation on a pre-main sequence binary system. Using intensity (Stokes I) and circularly polarised (Stokes V) timeseries s…
The first magnetic maps of a pre-main sequence binary star system - HD 155555
N. J. Dunstone, G. A. J. Hussain, A. Collier Cameron +5
We present the first maps of the surface magnetic fields of a pre-main sequence binary system. Spectropolarimetric observations of the young, 18 Myr, HD 155555 (V824 Ara, G5IV + K0…
Magnetospheric accretion on the T Tauri star BP Tauri
J. F. Donati, M. M. Jardine, S. G. Gregory +15
From observations collected with the ESPaDOnS and NARVAL spectropolarimeters, we report the detection of Zeeman signatures on the classical T Tauri star BP Tau. Circular polarisati…
Spectropolarimetric observations of the transiting planetary system of the K dwarf HD 189733
C. Moutou, J. -F. Donati, R. Savalle +7
With a Jupiter-mass planet orbiting at a distance of only 0.031 AU, the active K2 dwarf HD 189733 is a potential candidate in which to study the magnetospheric interactions of a co…
The coronal structure of AB Dor determined from contemporaneous Doppler imaging and X-ray spectroscopy
G. A. J. Hussain, M. Jardine, J. -F. Donati +6
We obtain contemporaneous observations of the surface and corona of AB Dor using ground-based circularly polarised spectra from the Anglo-Australian Telescope and X-ray data from t…
Magnetic topologies of cool stars
J. -F. Donati, M. M. Jardine, P. Petit +14
Stellar magnetic fields can be investigated using several, very complementary approaches. While conventional spectroscopy is capable of estimating the average magnetic strength of…
Direct Evidence for a Polar Spot on SV Cam
S. V. Jeffers, A. Collier Cameron, J. R. Barnes +2
We have used spectrophotometric data from the Hubble Space Telescope to eclipse-map the primary component of the RS CVn binary SV Cam over 9 HST orbits. We find from these observat…
Inferring coronal structure from X-ray lightcurves and Doppler shifts: a Chandra study of AB Doradus
G. A. J. Hussain, N. S. Brickhouse, A. K. Dupree +6
The Chandra X-ray observatory monitored the single cool star, AB Doradus, continuously for a period lasting 88 ksec (1.98 Prot) in 2002 December with the LETG/HRC-S. The X-ray ligh…
Inferring coronal structure using X-ray spectra: A Chandra study of AB Dor
G. A. J. Hussain, N. S. Brickhouse, A. K. Dupree +5
The Chandra X-ray observatory monitored the single cool star, AB Doradus, continuously for a period lasting 88ksec (1.98 Prot) in 2002 December with the LETG/HRC-S. The X-ray light…
Coronal element abundances of the post-common envelope binary V471 Tauri with ASCA
M. Still, G. A. J. Hussain
We report on ASCA observations of the coronally active companion star in the post-common envelope binary V471 Tauri. Evolutionary calculations indicate that there should be no pecu…
The coronal topology of the rapidly rotating K0 dwarf, AB Doradus I. Using surface magnetic field maps to model the structure of the stellar corona
G. A. J. Hussain, A. A. van Ballegooijen, M. Jardine +1
We re-analyse spectropolarimetric data of AB Dor taken in 1996 December using a surface imaging code that can model the magnetic field of the star as a non-potential current-carryi…
Modeling the corona of AB Doradus
G. A. J. Hussain, A. A. van Ballegooijen, M. Jardine +1
We present a technique that combines Zeeman Doppler imaging (ZDI) principles with a potential field mapping prescription in order to gain more information about the surface field t…
Mapping potential fields on the surfaces of rapidly rotating stars
G. A. J. Hussain, M. Jardine, A. Collier Cameron
We present a technique that combines Zeeman Doppler imaging (ZDI) principles with a potential field mapping prescription in order to gain more information about the surface field t…