Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333)
PUBLISHED 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 you...
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fttrinitycoll:oai:tara.tcd.ie:2262/79172 2023-05-15T18:50:48+02:00 Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333) VIDOTTO, ALINE 2017 2076 http://hdl.handle.net/2262/79172 http://people.tcd.ie/vidottoa http://vortexoptimus.com/search/http:/arxiv.org/abs/1611.07751 unknown Monthly Notices of the Royal Astronomical Society 465 Waite, I. A., Marsden, S. C., Carter, B. D., Petit, P., Jeffers, S. V., Morin, J., Vidotto, A. A., Donati, J.-F. & the Bcool collaboration, Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333), Monthly Notices of the Royal Astronomical Society, 465, 2017, 2076- Y http://hdl.handle.net/2262/79172 http://people.tcd.ie/vidottoa 144783 http://vortexoptimus.com/search/http:/arxiv.org/abs/1611.07751 orcid:0000-0001-5371-2675 Y openAccess magnetic fields Journal Article scholarly_publications refereed_publications 2017 fttrinitycoll 2020-02-16T13:56:33Z PUBLISHED 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 T\`elescope 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, \Omega_eq, of 2.50 +/- 0.08 rad/d. High levels of surface differential rotation were measured with an average rotational shear, \Delta\Omega, 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 Article in Journal/Newspaper narval narval The University of Dublin, Trinity College: TARA (Trinity's Access to Research Archive) Canada |
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The University of Dublin, Trinity College: TARA (Trinity's Access to Research Archive) |
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magnetic fields |
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magnetic fields VIDOTTO, ALINE Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333) |
topic_facet |
magnetic fields |
description |
PUBLISHED 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 T\`elescope 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, \Omega_eq, of 2.50 +/- 0.08 rad/d. High levels of surface differential rotation were measured with an average rotational shear, \Delta\Omega, 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 |
format |
Article in Journal/Newspaper |
author |
VIDOTTO, ALINE |
author_facet |
VIDOTTO, ALINE |
author_sort |
VIDOTTO, ALINE |
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) |
publishDate |
2017 |
url |
http://hdl.handle.net/2262/79172 http://people.tcd.ie/vidottoa http://vortexoptimus.com/search/http:/arxiv.org/abs/1611.07751 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
narval narval |
genre_facet |
narval narval |
op_relation |
Monthly Notices of the Royal Astronomical Society 465 Waite, I. A., Marsden, S. C., Carter, B. D., Petit, P., Jeffers, S. V., Morin, J., Vidotto, A. A., Donati, J.-F. & the Bcool collaboration, Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333), Monthly Notices of the Royal Astronomical Society, 465, 2017, 2076- Y http://hdl.handle.net/2262/79172 http://people.tcd.ie/vidottoa 144783 http://vortexoptimus.com/search/http:/arxiv.org/abs/1611.07751 orcid:0000-0001-5371-2675 |
op_rights |
Y openAccess |
_version_ |
1766244552475148288 |