Observations of non-solar-type dynamo processes in stars with shallow convective zones
International audience The magnetic field topology and differential rotation are fundamental signatures of the dynamo processes that generate the magnetic activity observed in the Sun and solar-type stars. To investigate how these dynamo processes evolve in stars with shallow convective zones, we pr...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Format: | Article in Journal/Newspaper |
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2011
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Online Access: | https://hal.science/hal-03742362 https://hal.science/hal-03742362/document https://hal.science/hal-03742362/file/mnras0411-1301.pdf https://doi.org/10.1111/j.1365-2966.2010.17762.x |
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Météo-France: HAL |
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English |
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[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
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[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Jeffers, S. V. Donati, Jean-François Alecian, Evelyne Marsden, S. C. Observations of non-solar-type dynamo processes in stars with shallow convective zones |
topic_facet |
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
description |
International audience The magnetic field topology and differential rotation are fundamental signatures of the dynamo processes that generate the magnetic activity observed in the Sun and solar-type stars. To investigate how these dynamo processes evolve in stars with shallow convective zones, we present high-resolution spectropolarimetric observations of the young GO dwarf HD 171488 over three epochs. Using the Zeeman-Doppler tomographic imaging technique, we have reconstructed surface brightness images that are dominated by polar and high-latitude starspots and a magnetic field topology that shows large-scale radial and azimuthal magnetic field components. Over the time-span of our observations, we do not observe a reversal of the magnetic field polarity as has been observed in other solar-type stars with shallow convective zones. The phase coverage of our data was sufficient to determine the differential rotation for two epochs where in conjunction with previous work, we conclude that there is no evidence for the temporal evolution of differential rotation. Spectropolarimetric observations were obtained, from 2007 May 21-26, 2007 November 8-13 and 2008 May 26-30 with the NARVAL echelle spectropolarimeter at the Telescope Bernard Lyot (Observatoire du Pic du Midi, France). |
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Universiteit Utrecht / Utrecht University Utrecht Laboratoire Astrophysique de Toulouse-Tarbes (LATT) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Etoile Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Australian Astronomical Observatory (AAO) |
format |
Article in Journal/Newspaper |
author |
Jeffers, S. V. Donati, Jean-François Alecian, Evelyne Marsden, S. C. |
author_facet |
Jeffers, S. V. Donati, Jean-François Alecian, Evelyne Marsden, S. C. |
author_sort |
Jeffers, S. V. |
title |
Observations of non-solar-type dynamo processes in stars with shallow convective zones |
title_short |
Observations of non-solar-type dynamo processes in stars with shallow convective zones |
title_full |
Observations of non-solar-type dynamo processes in stars with shallow convective zones |
title_fullStr |
Observations of non-solar-type dynamo processes in stars with shallow convective zones |
title_full_unstemmed |
Observations of non-solar-type dynamo processes in stars with shallow convective zones |
title_sort |
observations of non-solar-type dynamo processes in stars with shallow convective zones |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-03742362 https://hal.science/hal-03742362/document https://hal.science/hal-03742362/file/mnras0411-1301.pdf https://doi.org/10.1111/j.1365-2966.2010.17762.x |
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narval narval |
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narval narval |
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ISSN: 0035-8711 EISSN: 1365-2966 Monthly Notices of the Royal Astronomical Society https://hal.science/hal-03742362 Monthly Notices of the Royal Astronomical Society, 2011, 411, pp.1301-1312. ⟨10.1111/j.1365-2966.2010.17762.x⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2010.17762.x hal-03742362 https://hal.science/hal-03742362 https://hal.science/hal-03742362/document https://hal.science/hal-03742362/file/mnras0411-1301.pdf BIBCODE: 2011MNRAS.411.1301J doi:10.1111/j.1365-2966.2010.17762.x |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1111/j.1365-2966.2010.17762.x |
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Monthly Notices of the Royal Astronomical Society |
container_volume |
411 |
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2 |
container_start_page |
1301 |
op_container_end_page |
1312 |
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1809816210801426432 |
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ftmeteofrance:oai:HAL:hal-03742362v1 2024-09-09T20:14:33+00:00 Observations of non-solar-type dynamo processes in stars with shallow convective zones Jeffers, S. V. Donati, Jean-François Alecian, Evelyne Marsden, S. C. Universiteit Utrecht / Utrecht University Utrecht Laboratoire Astrophysique de Toulouse-Tarbes (LATT) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Etoile Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Australian Astronomical Observatory (AAO) 2011 https://hal.science/hal-03742362 https://hal.science/hal-03742362/document https://hal.science/hal-03742362/file/mnras0411-1301.pdf https://doi.org/10.1111/j.1365-2966.2010.17762.x en eng HAL CCSD Oxford University Press (OUP): Policy P - Oxford Open Option A info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2010.17762.x hal-03742362 https://hal.science/hal-03742362 https://hal.science/hal-03742362/document https://hal.science/hal-03742362/file/mnras0411-1301.pdf BIBCODE: 2011MNRAS.411.1301J doi:10.1111/j.1365-2966.2010.17762.x info:eu-repo/semantics/OpenAccess ISSN: 0035-8711 EISSN: 1365-2966 Monthly Notices of the Royal Astronomical Society https://hal.science/hal-03742362 Monthly Notices of the Royal Astronomical Society, 2011, 411, pp.1301-1312. ⟨10.1111/j.1365-2966.2010.17762.x⟩ [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] info:eu-repo/semantics/article Journal articles 2011 ftmeteofrance https://doi.org/10.1111/j.1365-2966.2010.17762.x 2024-06-25T00:08:36Z International audience The magnetic field topology and differential rotation are fundamental signatures of the dynamo processes that generate the magnetic activity observed in the Sun and solar-type stars. To investigate how these dynamo processes evolve in stars with shallow convective zones, we present high-resolution spectropolarimetric observations of the young GO dwarf HD 171488 over three epochs. Using the Zeeman-Doppler tomographic imaging technique, we have reconstructed surface brightness images that are dominated by polar and high-latitude starspots and a magnetic field topology that shows large-scale radial and azimuthal magnetic field components. Over the time-span of our observations, we do not observe a reversal of the magnetic field polarity as has been observed in other solar-type stars with shallow convective zones. The phase coverage of our data was sufficient to determine the differential rotation for two epochs where in conjunction with previous work, we conclude that there is no evidence for the temporal evolution of differential rotation. Spectropolarimetric observations were obtained, from 2007 May 21-26, 2007 November 8-13 and 2008 May 26-30 with the NARVAL echelle spectropolarimeter at the Telescope Bernard Lyot (Observatoire du Pic du Midi, France). Article in Journal/Newspaper narval narval Météo-France: HAL Monthly Notices of the Royal Astronomical Society 411 2 1301 1312 |