The potential magnetic field of AB Doradus: comparison with Zeeman-Doppler images

M  Jardine; J R  Barnes; J F  Donati; A  Collier Cameron

doi:10.1046/j.1365-8711.1999.02621.x

The potential magnetic field of AB Doradus: comparison with Zeeman-Doppler images

M Jardine, J R Barnes, J F Donati, A Collier Cameron

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27 Citations (Scopus)

Abstract

We have modelled the global-magnetic-field topology of the young, rapidly rotating KO dwarf AB Dor by assuming that the field is potential and using as a boundary condition Zeeman-Doppler images of the surface radial field obtained over three consecutive years. For each of the observed radial-field distributions, we calculate the azimuthal component of the corresponding potential field. We then compare at each epoch (by means of cross-correlation) the potential and observed azimuthal-field distributions, and find that there is a good correlation for magnetic features at latitudes below 60 degrees. Above this latitude, the potential field fails to reproduce the almost unidirectional band of azimuthal field that is observed and the correlation is correspondingly poor.

Original language	English
Pages (from-to)	L35-L39
Number of pages	5
Journal	Monthly Notices of the Royal Astronomical Society
Volume	305
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.1999.02621.x
Publication status	Published - 1 May 1999

Keywords

stars : activity
stars : coronae
stars : late-type
stars : magnetic fields
OUTFLOWS
WINDS

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10.1046/j.1365-8711.1999.02621.x

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title = "The potential magnetic field of AB Doradus: comparison with Zeeman-Doppler images",

abstract = "We have modelled the global-magnetic-field topology of the young, rapidly rotating KO dwarf AB Dor by assuming that the field is potential and using as a boundary condition Zeeman-Doppler images of the surface radial field obtained over three consecutive years. For each of the observed radial-field distributions, we calculate the azimuthal component of the corresponding potential field. We then compare at each epoch (by means of cross-correlation) the potential and observed azimuthal-field distributions, and find that there is a good correlation for magnetic features at latitudes below 60 degrees. Above this latitude, the potential field fails to reproduce the almost unidirectional band of azimuthal field that is observed and the correlation is correspondingly poor.",

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T1 - The potential magnetic field of AB Doradus: comparison with Zeeman-Doppler images

AU - Jardine, M

AU - Barnes, J R

AU - Donati, J F

AU - Collier Cameron, A

PY - 1999/5/1

Y1 - 1999/5/1

N2 - We have modelled the global-magnetic-field topology of the young, rapidly rotating KO dwarf AB Dor by assuming that the field is potential and using as a boundary condition Zeeman-Doppler images of the surface radial field obtained over three consecutive years. For each of the observed radial-field distributions, we calculate the azimuthal component of the corresponding potential field. We then compare at each epoch (by means of cross-correlation) the potential and observed azimuthal-field distributions, and find that there is a good correlation for magnetic features at latitudes below 60 degrees. Above this latitude, the potential field fails to reproduce the almost unidirectional band of azimuthal field that is observed and the correlation is correspondingly poor.

AB - We have modelled the global-magnetic-field topology of the young, rapidly rotating KO dwarf AB Dor by assuming that the field is potential and using as a boundary condition Zeeman-Doppler images of the surface radial field obtained over three consecutive years. For each of the observed radial-field distributions, we calculate the azimuthal component of the corresponding potential field. We then compare at each epoch (by means of cross-correlation) the potential and observed azimuthal-field distributions, and find that there is a good correlation for magnetic features at latitudes below 60 degrees. Above this latitude, the potential field fails to reproduce the almost unidirectional band of azimuthal field that is observed and the correlation is correspondingly poor.

KW - stars : activity

KW - stars : coronae

KW - stars : late-type

KW - stars : magnetic fields

KW - OUTFLOWS

KW - WINDS

U2 - 10.1046/j.1365-8711.1999.02621.x

DO - 10.1046/j.1365-8711.1999.02621.x

M3 - Letter

SN - 0035-8711

VL - 305

SP - L35-L39

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

The potential magnetic field of AB Doradus: comparison with Zeeman-Doppler images

Abstract

Keywords

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