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The energy budget of stellar magnetic fields

See, V. (author)
Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland.
Jardine, M. (author)
Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland.
Vidotto, A. A. (author)
Univ Geneva, Observ Geneve, CH-1290 Sauverny, Switzerland.
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Donati, J. -F (author)
Folsom, C. P. (author)
Univ Grenoble Alpes, IPAG, F-38000 Grenoble, France.;CNRS, IPAG, F-38000 Grenoble, France.
Saikia, S. Boro (author)
Univ Gottingen, Inst Astrophys, D-37077 Gottingen, Germany.
Bouvier, J. (author)
Univ Grenoble Alpes, IPAG, F-38000 Grenoble, France.;CNRS, IPAG, F-38000 Grenoble, France.
Fares, R. (author)
INAF Osservatorio Astrofis Catania, I-95123 Catania, Italy.
Gregory, S. G. (author)
Hussain, G. (author)
ESO, D-85748 Garching, Germany.
Jeffers, S. V. (author)
Marsden, S. C. (author)
Univ So Queensland, Computat Engn & Sci Res Ctr, Toowoomba, Qld 4350, Australia.
Morin, J. (author)
CNRS, LUPM UMR5299, F-34095 Montpellier, France.;Univ Montpellier 2, F-34095 Montpellier, France.
Moutou, C. (author)
CNRS, Canada France Hawaii Telescope Corp, Kamuela, HI 96743 USA.;Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France.
do Nascimento, J. D., Jr. (author)
Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, BR-59072970 Natal, RN, Brazil.;Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
Petit, P. (author)
Univ Toulouse, Inst Rech Astrophys & Planetol, UPS OMP, F-31400 Toulouse, France.;CNRS, Inst Rech Astrophys & Planetol, F-31400 Toulouse, France.
Rosén, Lisa (author)
Uppsala universitet,Institutionen för fysik och astronomi
Waite, I. A. (author)
Univ So Queensland, Computat Engn & Sci Res Ctr, Toowoomba, Qld 4350, Australia.
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Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland Univ Geneva, Observ Geneve, CH-1290 Sauverny, Switzerland. (creator_code:org_t)
2015-09-17
2015
English.
In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 453:4, s. 4301-4310
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Spectropolarimetric observations have been used to map stellar magnetic fields, many of which display strong bands of azimuthal fields that are toroidal. A number of explanations have been proposed to explain how such fields might be generated though none are definitive. In this paper, we examine the toroidal fields of a sample of 55 stars with magnetic maps, with masses in the range 0.1-1.5M(circle dot). We find that the energy contained in toroidal fields has a power-law dependence on the energy contained in poloidal fields. However the power index is not constant across our sample, with stars less and more massive than 0.5M(circle dot) having power indices of 0.72 +/- 0.08 and 1.25 +/- 0.06, respectively. There is some evidence that these two power laws correspond to stars in the saturated and unsaturated regimes of the rotation-activity relation. Additionally, our sample shows that strong toroidal fields must be generated axisymmetrically. The latitudes at which these bands appear depend on the stellar rotation period with fast rotators displaying higher latitude bands than slow rotators. The results in this paper present new constraints for future dynamo studies.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

techniques: polarimetric
stars: activity
stars: magnetic field
stars: rotation

Publication and Content Type

ref (subject category)
art (subject category)

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