Browsing by Author "Cameron, A C"

Now showing items 1-6 of 6

    • The boundaries of Doppler imaging: Starspot patterns on M dwarfs 

      Barnes, J R; James, D J; Cameron, A C (2002)
      With the advent of 8-m class telescopes and model atmospheres incorporating molecular opacities a great deal of interest has been directed towards the previously unexplored cool, low mass stars. M dwarfs are obviously a ...

    • The decrease in differential rotation with decreasing stellar mass in a sample of young rapidly rotating main sequence stars 

      Barnes, J R; Cameron, A C; Donati, J F; James, D J; Marsden, S C; Mengel, M; Petit, P (European Space Agency (ESA), 2005)
      In the Sun, global fluid circulation generates the large-scale magnetic field through cyclic dynamo action. Shear at the solar core/convection zone interface ensures that the convection zone does not rotate as a solid body. ...

    • Dense spot coverage and polar caps on SV Cam 

      Jeffers, S V; Cameron, A C; Barnes, J R; Aufdenberg, J P; Hussain, G A J (European Space Agency (ESA), 2005)
      We have used spectrophotometric data from 9 HST orbits to eclipse-map the primary component of the RS CVn binary SV Cam. From these observations and SV Cam's HIPPARCOS parallax we find that the surface flux in the eclipsed ...

    • Differential rotation and star-spot evolution on HK Aqr in 2001 and 2002 

      Barnes, J R; James, D J; Cameron, A C (2004-08-01)
      We present images of the rapidly rotating (P-rot = 0.431 d) M1.5Ve dwarf HK Aqr, from data obtained during 2001 and 2002. Star-spots are found distributed at a range of latitudes during both observing seasons, but unlike ...

    • High-resolution Doppler images of the spotted contact binary AE Phe 

      Barnes, J R; Lister, T A; Hilditch, R W; Cameron, A C (2004-03-11)
      We present Doppler images of the short period (P = 0.362 d) W UMa binary AE Phe. In order to obtain the necessary S/N ratio and time resolution required to see individual star-spot features in highly rotationally broadened ...

    • Surface images of the short period contact binary AE Phe 

      Barnes, J R; Lister, T A; Hilditch, R W; Cameron, A C (2004)
      We present high resolution Doppler images of the short period (P = 0.362 d) contact binary AE Phe. Using least squares deconvolution, we make use of the information content of the several thousand lines in each echelle ...