Use this URL to cite or link to this record in EThOS:
Title: The magnetic field of AB Doradûs
Author: Pointer, Graham Richard
Awarding Body: University of St Andrews
Current Institution: University of St Andrews
Date of Award: 2001
Availability of Full Text:
Access from EThOS:
Access from Institution:
Observations of AB Doradus, a nearby, rapidly-rotating K0 dwarf are analysed, and the surface magnetic field is shown to be approximated by a potential field. Evolving the surface magnetic field according to diffusion and the observed differential rotation still yields good correlation between the calculated and observed radial field after 30 days, contradictory to the results of Barnes et al. (1998), leading to the conclusion that there is an additional cause for the evolution of the magnetic field. The chromospheric magnetic field is modelled as a potential field with a source surface. Using the stability criteria g.B = 0 and B.V(g.B) < 0, places where prominences can be stable are investigated. For agreement with the results of Donati et al. (2000)- that prominences form preferentially near the equatorial plane and at and beyond corotation- it is necessary to add a quasidipolar field of maximum strength ~20G.
Supervisor: Cameron, Andrew Collier Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QB843.D9P7 ; Dwarf stars ; Stars--Magnetic fields