Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333)
The magnetic fields, activity and dynamos of young solar-type stars can be empirically studied using time-series of spectropolarimetric observations and tomographic imaging techniques such as Doppler imaging and Zeeman Doppler imaging. In this paper we use these techniques to study the young Sun-lik...
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ftdatacite:10.48550/arxiv.1611.07751 2023-05-15T18:50:48+02:00 Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333) Waite, Ian Marsden, Stephen Carter, Brad Petit, Pascal Jeffers, Sandra Morin, Julien Vidotto, Aline Donati, Jean-Francois Collaboration, the BCool 2016 https://dx.doi.org/10.48550/arxiv.1611.07751 https://arxiv.org/abs/1611.07751 unknown arXiv https://dx.doi.org/10.1093/mnras/stw2731 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 2016 ftdatacite https://doi.org/10.48550/arxiv.1611.07751 https://doi.org/10.1093/mnras/stw2731 2022-04-01T11:15:15Z The magnetic fields, activity and dynamos of young solar-type stars can be empirically studied using time-series of spectropolarimetric observations and tomographic imaging techniques such as Doppler imaging and Zeeman Doppler imaging. In this paper we use these techniques to study the young Sun-like star EK Draconis (Sp-Type: G1.5V, HD 129333) using ESPaDOnS at the Canada-France-Hawaii Telescope and NARVAL at the Tèlescope Bernard Lyot. This multi-epoch study runs from late 2006 until early 2012. We measure high levels of chromospheric activity indicating an active, and varying, chromosphere. Surface brightness features were constructed for all available epochs. The 2006/7 and 2008 data show large spot features appearing at intermediate-latitudes. However, the 2012 data indicate a distinctive polar spot. We observe a strong, almost unipolar, azimuthal field during all epochs that is similar to that observed on other Sun-like stars. Using magnetic features, we determined an average equatorial rotational velocity, Ω_eq, of 2.50 +/- 0.08 rad/d. High levels of surface differential rotation were measured with an average rotational shear, ΔΩ, of 0.27 +0.24-0.26 rad/d. During an intensively observed 3-month period from December 2006 until February 2007, the magnetic field went from predominantly toroidal ( approx. 80%) to a more balanced poloidal-toroidal (approx. 40-60%) field. Although the large-scale magnetic field evolved over the epochs of our observations, no polarity reversals were found in our data. : MNRAS: Accepted. 17 pages, 10 figures, 8 tables Text narval narval DataCite Metadata Store (German National Library of Science and Technology) Canada |
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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 Waite, Ian Marsden, Stephen Carter, Brad Petit, Pascal Jeffers, Sandra Morin, Julien Vidotto, Aline Donati, Jean-Francois Collaboration, the BCool Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333) |
topic_facet |
Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
description |
The magnetic fields, activity and dynamos of young solar-type stars can be empirically studied using time-series of spectropolarimetric observations and tomographic imaging techniques such as Doppler imaging and Zeeman Doppler imaging. In this paper we use these techniques to study the young Sun-like star EK Draconis (Sp-Type: G1.5V, HD 129333) using ESPaDOnS at the Canada-France-Hawaii Telescope and NARVAL at the Tèlescope Bernard Lyot. This multi-epoch study runs from late 2006 until early 2012. We measure high levels of chromospheric activity indicating an active, and varying, chromosphere. Surface brightness features were constructed for all available epochs. The 2006/7 and 2008 data show large spot features appearing at intermediate-latitudes. However, the 2012 data indicate a distinctive polar spot. We observe a strong, almost unipolar, azimuthal field during all epochs that is similar to that observed on other Sun-like stars. Using magnetic features, we determined an average equatorial rotational velocity, Ω_eq, of 2.50 +/- 0.08 rad/d. High levels of surface differential rotation were measured with an average rotational shear, ΔΩ, of 0.27 +0.24-0.26 rad/d. During an intensively observed 3-month period from December 2006 until February 2007, the magnetic field went from predominantly toroidal ( approx. 80%) to a more balanced poloidal-toroidal (approx. 40-60%) field. Although the large-scale magnetic field evolved over the epochs of our observations, no polarity reversals were found in our data. : MNRAS: Accepted. 17 pages, 10 figures, 8 tables |
format |
Text |
author |
Waite, Ian Marsden, Stephen Carter, Brad Petit, Pascal Jeffers, Sandra Morin, Julien Vidotto, Aline Donati, Jean-Francois Collaboration, the BCool |
author_facet |
Waite, Ian Marsden, Stephen Carter, Brad Petit, Pascal Jeffers, Sandra Morin, Julien Vidotto, Aline Donati, Jean-Francois Collaboration, the BCool |
author_sort |
Waite, Ian |
title |
Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333) |
title_short |
Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333) |
title_full |
Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333) |
title_fullStr |
Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333) |
title_full_unstemmed |
Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333) |
title_sort |
magnetic fields on young, moderately rotating sun-like stars ii. ek draconis (hd 129333) |
publisher |
arXiv |
publishDate |
2016 |
url |
https://dx.doi.org/10.48550/arxiv.1611.07751 https://arxiv.org/abs/1611.07751 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
narval narval |
genre_facet |
narval narval |
op_relation |
https://dx.doi.org/10.1093/mnras/stw2731 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1611.07751 https://doi.org/10.1093/mnras/stw2731 |
_version_ |
1766244556535234560 |