Linking chromospheric activity and magnetic field properties for late-type dwarf stars
Article
Article Title | Linking chromospheric activity and magnetic field properties for late-type dwarf stars |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Brown, E. L. (Author), Jeffers, S. V. (Author), Marsden, S. C. (Author), Morin, J. (Author), Boro Saikia, S. (Author), Petit, P. (Author), Jardine, M. M. (Author), See, V. (Author), Vidotto, A. A. (Author), Mengel, M. W. (Author) and Dahlkemper, M. N. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 514 (3), pp. 4300-4319 |
Number of Pages | 20 |
Year | 2022 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stac1291 |
Web Address (URL) | https://academic.oup.com/mnras/article/514/3/4300/6583303 |
Abstract | Spectropolarimetric data allow for simultaneous monitoring of stellar chromospheric log R'HK activity and the surface-averaged longitudinal magnetic field, Bl, giving the opportunity to probe the relationship between large-scale stellar magnetic fields and chromospheric manifestations of magnetism. We present log R'HK and/or Bl measurements for 954 mid-F to mid-M stars derived from spectropolarimetric observations contained within the PolarBase database. Our magnetically active sample complements previous stellar activity surveys that focus on inactive planet-search targets. We find a positive correlation between mean log R'HK and mean log |Bl|, but for G stars the relationship may undergo a change between log R'HK ~ -4.4 and -4.8. The mean log R'HK shows a similar change with respect to the log R'HK variability amplitude for intermediately active G stars. We also combine our results with archival chromospheric activity data and published observations of large-scale magnetic field geometries derived using Zeeman-Doppler Imaging. The chromospheric activity data indicate a slight under-density of late-F to early-K stars with -4.75 ≤ log R'HK ≤ -4.5. This is not as prominent as the original Vaughan-Preston gap, and we do not detect similar underpopulated regions in the distributions of the mean |Bl|, or the Bl and log R'HK variability amplitudes. Chromospheric activity, activity variability, and toroidal field strength decrease on the main sequence as rotation slows. For G stars, the disappearance of dominant toroidal fields occurs at a similar chromospheric activity level asthe change in the relationships between chromospheric activity, activity variability, and mean field strength. |
Keywords | Stars: activity; stars: late-type; stars: magnetic field |
Related Output | |
Is part of | The magnetic fields, activity and hidden companions of solar-type stars |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
This article is part of a UniSQ Thesis by publication. See Related Output. | |
Byline Affiliations | Centre for Astrophysics |
Max Planck Society, Germany | |
University of Montpellier, France | |
University of Vienna, Austria | |
University of Toulouse, France | |
University of St Andrews, United Kingdom | |
European Space Agency, France | |
University of Dublin, Ireland | |
University of Gottingen, Germany | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7vx8/linking-chromospheric-activity-and-magnetic-field-properties-for-late-type-dwarf-stars
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