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Browsing by Author "Collier Cameron, A."
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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 coronal structure of Speedy Mic - I. A densely packed prominence system beyond corotation
Dunstone, N.J.; Barnes, J.R.; Collier Cameron, A.; Jardine, M. (2006)We present new observations of the prominence system on the K3 dwarf Speedy Mic (BO Mic, HD 197890). Using an improved technique to track the absorption features in Hα we find a very active prominence system with approximately ... -
The coronal structure of Speedy Mic - II: Prominence masses and off-disc emission
Dunstone, N.J.; Collier Cameron, A.; Barnes, J.R.; Jardine, M. (2006)Observations of stellar prominences on young rapidly rotating stars provide unique probes of their magnetic fields out to many stellar radii. We compare two independently obtained datasets of the K3 dwarf Speedy Mic (BOMic, ... -
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) -
Direct Evidence for a Polar Spot on SV Camelopardalis
Jeffers, S.V.; Collier Cameron, A.; Barnes, J.R.; Aufdenberg, J.P.; Hussain, G.A.J. (2005) -
Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004
Xiang, Yue; Gu, Sheng Hong; Collier Cameron, A.; Barnes, J.R. (2014-02-01)We present Doppler images of RS CVn-type binary II Peg based on two data sets obtained in 2004 February and November. In order to improve signal-to-noise ratio and reliability,we apply least-squares deconvolution technique ... -
Doppler images of the eclipsing binary ER Vulpeculae
Xiang, Yue; Gu, Shenghong; Collier Cameron, A.; Barnes, J.R. (2015-02-11)We present Doppler images of both components of the eclipsing binary system ER Vul, based on the spectra obtained in 2004 November, 2006 September and 2008 November. The least-squares deconvolution technique is used for ... -
Doppler images of the RS CVn binary HR 1099 (V711 Tau) from the MUSICOS 1998 campaign
Garcia-Alvarez, D.; Barnes, J.R.; Collier Cameron, A.; Doyle, J.G.; Messina, S.; Lanza, A.F.; Rodon, M. (2003) -
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) -
Limits on the 2.2- m contrast ratio of the close-orbiting planet HD 189733b
Barnes, J.R.; Barman, T.S.; Prato, L.; Segransan, D.; Jones, H.R.A.; Leigh, C.J.; Collier Cameron, A.; Pinfield, D.J. (2007) -
Lithium in optically-selected G and K stars in NGC 6475 (220 Myr)
James, D.J.; Collier Cameron, A.; Barnes, J.R.; Jeffries, R.D. (Astronomical Society of the Pacific, 2000)Photometric members of the open cluster NGC 6475 were observed using high resolution spectroscopy for analysis of lithium abundances in their atmospheres. We combine these new data with previously obtained lithium data, ... -
LO Peg in 1998: star-spot patterns and differential rotation
Barnes, J.R.; Collier Cameron, A.; Lister, T.A.; Pointer, G.R.; Still, M.D. (2005) -
Near infrared spectroscopic search for the close orbiting planet HD 75289b
Barnes, J.R.; Leigh, C.J.; Jones, H.R.A.; Barman, T.S.; Pinfield, D.J.; Collier Cameron, A.; Jenkins, J.S. (2007)We present a search for the near infrared spectroscopic signature of the close orbiting extrasolar giant planet HD 75289b. We obtained »230 spectra in the wavelength range 2.18 ¹m- 2.19 ¹m using the Phoenix spectrograph ... -
Prominences on Rapidly-Rotating Solar-Type Stars
Jardine, M.; Barnes, J.R.; Unruh, Y.C.; Collier Cameron, A. (Astronomical Society of the Pacific, 1998)We present Ha observations of two rapidly-rotating G2 dwarfs in the Alpha Persei cluster and of AB Dor, a young K0 dwarf. -
Spectroscopic characterisation of close orbiting extrasolar giant planets
Barnes, J.R.; Barman, T.S.; Jones, H.R.A.; Leigh, C.J.; Collier Cameron, A.; Prato, L.; Barber, R.J. (American Institute of Physics (AIP), 2009)A number of successful mid-infrared detections and studies of close orbiting extrasolar giant planetary atmospheres have been responsible for both driving and informing modelling efforts. Recent models have indicated that ... -
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 ... -
SuperWASP-N extra-solar planet candidates between 18hr<RA<21hr
Street, R.A.; Christian, D.J.; Clarkson, W.I.; Collier Cameron, A.; Enoch, B.; Kane, S.R.; Lister, T.A.; West, R.G.; Wilson, D.M.; Evans, A.; Fitzsimmons, A.; Haswell, C.A.; Hellier, C.; Hodgkin, S.T.; Horne, K.; Irwin, J.; Keenan, F.P.; Norton, A.J.; Osborne, J.P.; Pollacco, D.L.; Ryans, R.; Skillen, I.; Wheatley, P.J.; Barnes, J.R. (2007) -
SuperWASP-North extrasolar planet candidates. Candidates from fields 17hr<RA<18hr
Lister, T.A.; West, R.G.; Wilson, D.M.; Collier Cameron, A.; Clarkson, W.I.; Street, R.A.; Enoch, B.; Parley, N.R.; Christian, D.J.; Kane, S.R.; Evans, A.; Fitzsimmons, A.; Haswell, C.A.; Hellier, C.; Hodgkin, S.T.; Horne, K.; Irwin, J.; Keenan, F.P.; Norton, A.J.; Osborne, J.P.; Pollacco, D.L.; Ryans, R.; Skillen, I.; Wheatley, P.J.; Barnes, J.R. (2007)