Observations of non-solar-type dynamo processes in stars with shallow convective zones
Article
Article Title | Observations of non-solar-type dynamo processes in stars with shallow convective zones |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Jeffers, S. V. (Author), Donati, J. -F. (Author), Alecian, E. (Author) and Marsden, S. C. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 411 (2), pp. 1301-1312 |
Number of Pages | 12 |
Year | 2011 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/j.1365-2966.2010.17762.x |
Web Address (URL) | https://academic.oup.com/mnras/article/411/2/1301/1278900 |
Abstract | 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 HD171488 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. |
Keywords | stars; HD171488; magnetic field; solar-type; starspots |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
519999. Other physical sciences not elsewhere classified | |
510903. Mesospheric, thermospheric, ionospheric and magnetospheric physics | |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2011 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Utrecht University, Netherlands |
Institute for Research in Astrophysics and Planetology, France | |
Laboratory of Space Science and Astrophysical Instrumentation, France | |
Anglo-Australian Observatory, Australia | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q277x/observations-of-non-solar-type-dynamo-processes-in-stars-with-shallow-convective-zones
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