Long-term magnetic field monitoring of the Sun-like star ξBootis A
Aims. We aim to investigate the long-term temporal evolution of the magnetic field of the solar-type star ξBootis A, both from direct magnetic field measurements and from the simultaneous estimate of indirect activity indicators. Methods. We obtained seven epochs of high-resolution, circularly-polar...
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ftdatacite:10.48550/arxiv.1109.5066 2023-05-15T18:50:48+02:00 Long-term magnetic field monitoring of the Sun-like star ξBootis A Morgenthaler, A. Petit, P. Saar, S. Solanki, S. K. Morin, J. Marsden, S. C. Auriere, M. Dintrans, B. Fares, R. Gastine, T. Lanoux, J. Lignieres, F. Paletou, F. Velez, J. C. Ramirez Theado, S. Van Grootel, V. 2011 https://dx.doi.org/10.48550/arxiv.1109.5066 https://arxiv.org/abs/1109.5066 unknown arXiv https://dx.doi.org/10.1051/0004-6361/201118139 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences article-journal Article ScholarlyArticle Text 2011 ftdatacite https://doi.org/10.48550/arxiv.1109.5066 https://doi.org/10.1051/0004-6361/201118139 2022-04-01T14:05:42Z Aims. We aim to investigate the long-term temporal evolution of the magnetic field of the solar-type star ξBootis A, both from direct magnetic field measurements and from the simultaneous estimate of indirect activity indicators. Methods. We obtained seven epochs of high-resolution, circularly-polarized spectra from the NARVAL spectropolarimeter between 2007 and 2011, for a total of 76 spectra. Using approximately 6,100 photospheric spectral lines covering the visible domain, we employed a cross-correlation procedure to compute a mean polarized line profile from each spectrum. The large-scale photospheric magnetic field of the star was then modelled by means of Zeeman-Doppler Imaging, allowing us to follow the year-to-year evolution of the reconstructed magnetic topology. Simultaneously, we monitored the width of several magnetically sensitive spectral lines, the radial velocity, the line asymmetry of intensity line profiles, and the chromospheric emission in the cores of the Ca II H and Halpha lines. Results. During the highest observed activity states, in 2007 and 2011, the large-scale field of ξBoo A is almost completely axisymmetric and is dominated by its toroidal component. The magnetic topologies reconstructed for these activity maxima are very similar, suggesting a form of short cyclicity in the large-scale field distribution. Correlated temporal evolution, due to both rotational modulation and seasonal variability, is observed between the Ca II emission, the Halpha emission and the width of magnetically sensitive lines. When measurable, the differential rotation reveals a strong latitudinal shear in excess of 0.2 rad/d. : 16 pages, 8 figures, accepted for publication in A&A, abstract shortened to respect the 1920 characters required Text narval narval DataCite Metadata Store (German National Library of Science and Technology) |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences Morgenthaler, A. Petit, P. Saar, S. Solanki, S. K. Morin, J. Marsden, S. C. Auriere, M. Dintrans, B. Fares, R. Gastine, T. Lanoux, J. Lignieres, F. Paletou, F. Velez, J. C. Ramirez Theado, S. Van Grootel, V. Long-term magnetic field monitoring of the Sun-like star ξBootis A |
topic_facet |
Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
description |
Aims. We aim to investigate the long-term temporal evolution of the magnetic field of the solar-type star ξBootis A, both from direct magnetic field measurements and from the simultaneous estimate of indirect activity indicators. Methods. We obtained seven epochs of high-resolution, circularly-polarized spectra from the NARVAL spectropolarimeter between 2007 and 2011, for a total of 76 spectra. Using approximately 6,100 photospheric spectral lines covering the visible domain, we employed a cross-correlation procedure to compute a mean polarized line profile from each spectrum. The large-scale photospheric magnetic field of the star was then modelled by means of Zeeman-Doppler Imaging, allowing us to follow the year-to-year evolution of the reconstructed magnetic topology. Simultaneously, we monitored the width of several magnetically sensitive spectral lines, the radial velocity, the line asymmetry of intensity line profiles, and the chromospheric emission in the cores of the Ca II H and Halpha lines. Results. During the highest observed activity states, in 2007 and 2011, the large-scale field of ξBoo A is almost completely axisymmetric and is dominated by its toroidal component. The magnetic topologies reconstructed for these activity maxima are very similar, suggesting a form of short cyclicity in the large-scale field distribution. Correlated temporal evolution, due to both rotational modulation and seasonal variability, is observed between the Ca II emission, the Halpha emission and the width of magnetically sensitive lines. When measurable, the differential rotation reveals a strong latitudinal shear in excess of 0.2 rad/d. : 16 pages, 8 figures, accepted for publication in A&A, abstract shortened to respect the 1920 characters required |
format |
Text |
author |
Morgenthaler, A. Petit, P. Saar, S. Solanki, S. K. Morin, J. Marsden, S. C. Auriere, M. Dintrans, B. Fares, R. Gastine, T. Lanoux, J. Lignieres, F. Paletou, F. Velez, J. C. Ramirez Theado, S. Van Grootel, V. |
author_facet |
Morgenthaler, A. Petit, P. Saar, S. Solanki, S. K. Morin, J. Marsden, S. C. Auriere, M. Dintrans, B. Fares, R. Gastine, T. Lanoux, J. Lignieres, F. Paletou, F. Velez, J. C. Ramirez Theado, S. Van Grootel, V. |
author_sort |
Morgenthaler, A. |
title |
Long-term magnetic field monitoring of the Sun-like star ξBootis A |
title_short |
Long-term magnetic field monitoring of the Sun-like star ξBootis A |
title_full |
Long-term magnetic field monitoring of the Sun-like star ξBootis A |
title_fullStr |
Long-term magnetic field monitoring of the Sun-like star ξBootis A |
title_full_unstemmed |
Long-term magnetic field monitoring of the Sun-like star ξBootis A |
title_sort |
long-term magnetic field monitoring of the sun-like star ξbootis a |
publisher |
arXiv |
publishDate |
2011 |
url |
https://dx.doi.org/10.48550/arxiv.1109.5066 https://arxiv.org/abs/1109.5066 |
genre |
narval narval |
genre_facet |
narval narval |
op_relation |
https://dx.doi.org/10.1051/0004-6361/201118139 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1109.5066 https://doi.org/10.1051/0004-6361/201118139 |
_version_ |
1766244560677109760 |