The energy budget of stellar magnetic fields
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 th...
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ri-123456789-290432020-05-24T09:21:26Z The energy budget of stellar magnetic fields See, V. Jardine, M. Vidotto, A. A. Donati, J. F. Folsom, C. P. Saikia, S. Boro Bouvier, J. Fares, R. Gregory, S. G. Hussain, G. Jeffers, S.V. Marsden, S. C. Morin, J. Moutou, C. Nascimento Júnior, José Dias do Petit, P. Rosén, L. Waite, A. Techniques - polarimetric Stars - activity Stars - magnetic field Stars - rotation 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 . 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 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 rotationactivityrelation. 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 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 . 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 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 rotationactivityrelation. 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 2020-05-21T17:33:12Z 2020-05-21T17:33:12Z 2015-06-02 article SEE, V.; JARDINE, M.; VIDOTTO, A. A.; DONATI, J.-f.; FOLSOM, C. P.; SAIKIA, S. Boro; BOUVIER, J.; FARES, R.; GREGORY, S. G.; HUSSAIN, G.; NASCIMENTO JUNIOR, J. D.do. The energy budget of stellar magnetic fields. Monthly Notices of the Royal Astronomical Society, [s.l.], v. 453, n. 4, p. 4302-4311, 17 set. 2015. Disponível em: http://dx.doi.org/10.1093/mnras/stv1925. Acesso em: 13 mai. 2020. 1678-765X https://repositorio.ufrn.br/jspui/handle/123456789/29043 10.1093/mnras/stv1925 en application/pdf Royal Astronomic Society |
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Techniques - polarimetric Stars - activity Stars - magnetic field Stars - rotation |
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Techniques - polarimetric Stars - activity Stars - magnetic field Stars - rotation See, V. Jardine, M. Vidotto, A. A. Donati, J. F. Folsom, C. P. Saikia, S. Boro Bouvier, J. Fares, R. Gregory, S. G. Hussain, G. Jeffers, S.V. Marsden, S. C. Morin, J. Moutou, C. Nascimento Júnior, José Dias do Petit, P. Rosén, L. Waite, A. The energy budget of stellar magnetic fields |
| description |
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 . 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 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 rotationactivityrelation. 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 |
| format |
article |
| author |
See, V. Jardine, M. Vidotto, A. A. Donati, J. F. Folsom, C. P. Saikia, S. Boro Bouvier, J. Fares, R. Gregory, S. G. Hussain, G. Jeffers, S.V. Marsden, S. C. Morin, J. Moutou, C. Nascimento Júnior, José Dias do Petit, P. Rosén, L. Waite, A. |
| author_facet |
See, V. Jardine, M. Vidotto, A. A. Donati, J. F. Folsom, C. P. Saikia, S. Boro Bouvier, J. Fares, R. Gregory, S. G. Hussain, G. Jeffers, S.V. Marsden, S. C. Morin, J. Moutou, C. Nascimento Júnior, José Dias do Petit, P. Rosén, L. Waite, A. |
| author_sort |
See, V. |
| title |
The energy budget of stellar magnetic fields |
| title_short |
The energy budget of stellar magnetic fields |
| title_full |
The energy budget of stellar magnetic fields |
| title_fullStr |
The energy budget of stellar magnetic fields |
| title_full_unstemmed |
The energy budget of stellar magnetic fields |
| title_sort |
energy budget of stellar magnetic fields |
| publisher |
Royal Astronomic Society |
| publishDate |
2020 |
| url |
https://repositorio.ufrn.br/jspui/handle/123456789/29043 |
| work_keys_str_mv |
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| _version_ |
1773960238856142848 |