Donati, J. -F., Skelly, M. B., Bouvier, J., Jardine, M. M., Gregory, S. G., Morin, J., ...
From observations collected with the ESPaDOnS spectropolarimeter at the Canada-France-Hawaii Telescope, we report the detection of Zeeman signatures on the low-mass classical TTauri star (cTTS)...
Surface magnetic fields on two accreting T Tauri stars: CV Cha and CR Cha (2009)
Hussain, G. A. J., Collier Cameron, A., Jardine, M. M., Dunstone, N., Ramirez Velez, J., Stempels, H. C., ...
[Abstract]: We have produced brightness and magnetic field maps of the surfaces of CV Cha and CR Cha: two actively accreting G- and K-type T Tauri stars in the Chamaeleon I star-forming cloud with...
Multi-wavelength observing of a forming solar-like star (2009)
Gregory, S. G., Flaccomio, E., Argiroffi, C., Bouvier, J., Donati, J. -F., Feigelson, E. D., ...
V2129 Oph is a 1.35 solar mass classical T Tauri star, known to possess a strong and complex magnetic field. By extrapolating from an observationally derived magnetic surface map, obtained through...
Surface magnetic fields on two accreting T Tauri stars: CV Cha and CR Cha (2009)
Hussain, G. A. J., Cameron, A. Collier, Jardine, M. M., Dunstone, N., Velez, J. Ramirez, Stempels, H. C., ...
We have produced brightness and magnetic field maps of the surfaces of CV Cha and CR Cha: two actively accreting G and K-type T Tauri stars in the Chamaeleon I star-forming cloud with ages of 3-5...
Surface magnetic fields on two accreting T Tauri stars: CV Cha and CR Cha (2009)
Hussain, G. A. J., Collier Cameron, A., Jardine, M. M., Dunstone, N. J., Ramirez Velez, J., Stempels, H. C., ...
[Abstract]: We have produced brightness and magnetic field maps of the surfaces of CV Cha and CR Cha: two actively accreting G- and K-type T Tauri stars in the Chamaeleon I star-forming cloud with...
Differential rotation on both components of the pre main-sequence binary system HD 155555 (2008)
Dunstone, N. J., Hussain, G. A. J., Cameron, A. Collier, Marsden, S. C., Jardine, M., Barnes, J. R., ...
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 spectra, taken over...
The first magnetic maps of a pre-main sequence binary star system - HD 155555 (2008)
Dunstone, N. J., Hussain, G. A. J., Cameron, A. Collier, Marsden, S. C., Jardine, M., Stempels, H. C., ...
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 + K0IV) system were...
Magnetospheric accretion on the T Tauri star BP Tauri (2008)
Donati, J. F., Jardine, M. M., Gregory, S. G., Petit, P., Paletou, F., Bouvier, J., ...
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 polarisation signatures in...
Differential rotation on both components of the pre main-sequence binary system HD 155555. (2008)
Dunstone, N.J., Hussain, G.A.J., Collier Cameron, A., Marsden, S.C., Jardine, M., Barnes, J.R., ...
‘The definitive version is available at www.blackwell-synergy.com.’ Copyright Blackwell Publishing DOI: 10.1111/j.1365-2966.2008.13338.x
Hussain, G. A. J., Jardine, M., Donati, J. -F., Brickhouse, N. S., Dunstone, N. J., Wood, K., ...
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 the Chandra...
Magnetic topologies of cool stars (2007)
Donati, J. -F., Jardine, M. M., Petit, P., Morin, J., Bouvier, J., Cameron, A. C., ...
Stellar magnetic fields can be investigated using several, very complementary approaches. While conventional spectroscopy is capable of estimating the average magnetic strength of potentially complex...
Spot patterns and differential rotation in the eclipsing pre-CV binary,V471 Tau (2006)
Hussain, G. A. J., Prieto, C. Allende, Saar, S. H., Still, M. D.
We present surface spot maps of the K2V primary star in the pre-cataclysmic variable binary system, V471 Tau. The spot maps show the presence of large high latitude spots located at the sub-white...
Jeffers, S. V., Aufdenberg, J. P., Hussain, G. A. J., Cameron, A. Collier, Holzwarth, V. R.
The variation of the specific intensity across the stellar disc is essential input parameter in surface brightness reconstruction techniques such as Doppler imaging, where the relative intensity...
Direct Evidence for a Polar Spot on SV Cam (2005)
Jeffers, S. V., Cameron, A. Collier, Barnes, J. R., Aufdenberg, J. P., Hussain, G. A. J.
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 observations and the...
Direct Evidence for a Polar Spot on SV Camelopardalis. (2005)
Jeffers, S.V., Collier Cameron, A., Barnes, J.R., Aufdenberg, J.P., Hussain, G.A.J.
Hussain, G. A. J., Brickhouse, N. S., Dupree, A. K., Jardine, M. M., Van Ballegooijen, A. A., Hoogerwerf, R., ...
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 lightcurve shows...
Inferring coronal structure using X-ray spectra: A Chandra study of AB Dor (2004)
Hussain, G. A. J., Brickhouse, N. S., Dupree, A. K., Jardine, M., Van Ballegooijen, A., Cameron, A. Collier, ...
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 lightcurve shows...
Coronal element abundances of the post-common envelope binary V471 Tauri with ASCA (2003)
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 peculiar abundances on...
Hussain, G. A. J., Van Ballegooijen, A. A., Jardine, M., Cameron, A. Col Lier
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-carrying magnetic field....
Modeling the corona of AB Doradus (2001)
Hussain, G. A. J., Van Ballegooijen, A. A., Jardine, M., Cameron, A. Collier
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 topology of rapid...
Mapping potential fields on the surfaces of rapidly rotating stars (2000)
Hussain, G. A. J., Jardine, M., Cameron, A. Collier
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 topology of rapid...