The AB Dor Picture Gallery

The starspots and corona of AB Dor

A computer reconstruction shows the surface of the young star AB Doradus to
be mottled by the giant starspots that betray its twisting rotation.  The
St Andrews-Toulouse team have also mapped the magnetic field patterns on
the star's surface.  Tenuous hydrogen plasma, heated to 15 million degrees
C, is trapped in the magnetic fields that arch over the star's surface.
This plasma glows in X-rays, shown here in red.  (Picture credit:
A. Cameron, M. Jardine and K. Wood, University of St Andrews).

Differential rotation on AB Doradus

In  1997, Jean-Francois Donati & Andrew Collier Cameron published the discovery that AB Dor's equator spins
faster than its poles. This animation presents three consecutive images of AB Dor recorded in 1996 Dec 24, 27
and 29 respectively (in infinte loop). It shows AB Dor as viewed from an observer in the corotating
 frame. One can clearly see the lower latitude features rotating faster than high-latitude ones.
These results were published by Donati & Cameron (1997) and by Donati et al (1999).
[Credit: Jean-Francois Donati, Obs. Midi-Pyrenees]

The twisting rotation of AB Doradus

The St Andrews/Toulouse imaging team measured the twisting rotation of AB Doradus, by
tracking the rotation of individual starspots at different latitudes over
several nights. Spots near the equator always rotate faster than those at
the poles, but in 1988 and 1996 the difference between the equatorial and
polar spin rates was only half as great as in 1992 to 1995. For a full-size JPEG version of this image, click here.
[Credit: Andrew Collier Cameron, University of St Andrews.]

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