%0 Journal Article
%T A Bcool magnetic snapshot survey of solar-type stars
%+ Computational Engineering and Science Research Centre
%+ Institut de recherche en astrophysique et planétologie (IRAP)
%+ Institut für Astrophysik [Göttingen]
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%+ University of St Andrews [Scotland]
%+ Universidade Federal do Rio Grande do Norte [Natal] (UFRN)
%+ Institut de Planétologie et d'Astrophysique de Grenoble (IPAG )
%+ University of Southern Queensland (USQ)
%+ Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA)
%+ Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS)
%+ Bulgarian Academy of Sciences (BAS)
%+ Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM)
%+ Université de Liège
%A Marsden, S. C.
%A Petit, P.
%A Jeffers, S. V.
%A Morin, Julien
%A Fares, R.
%A Reiners, A.
%A Nascimento, J. D. Do
%A Auriere, M.
%A Bouvier, J.
%A Carter, B. D.
%A Catala, C.
%A Dintrans, B.
%A Donati, J. -F.
%A Gastine, T.
%A Jardine, M.
%A Konstantinova-Antova, R.
%A Lanoux, J.
%A Lignieres, F.
%A Morgenthaler, A.
%A Ramirez-Velez, J. C.
%A Theado, S.
%A van Grootel, V.
%A Collaboration, The Bcool
%Z 36 pages, 26 figures, 7 tables
%< avec comité de lecture
%Z LUPM:13-040
%@ 0035-8711
%J Monthly Notices of the Royal Astronomical Society
%I Oxford University Press (OUP): Policy P - Oxford Open Option A
%V 444
%P 3517
%8 2014-11-11
%D 2014
%Z 1311.3374
%Z 2014MNRAS.444.3517M
%R 10.1093/mnras/stu1663
%K Stars : activity
%K Stars : magnetic fields
%K line : profiles
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
%Z Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]Journal articles
%X Stellar magnetic field measurements obtained from spectropolarimetry offer key data for activity and dynamo studies, and we present the results of a major high-resolution spectropolarimetric Bcool project magnetic snapshot survey of 170 solar-type stars from observations with the Telescope Bernard Lyot and the Canada-France-Hawaii Telescope. For each target star a high signal-to-noise circularly polarised Stokes V profile has been obtained using Least-Squares Deconvolution, and used to detect surface magnetic fields and measure the corresponding mean surface longitudinal magnetic field ($B_{l}$). Chromospheric activity indicators were also measured. Surface magnetic fields were detected for 67 stars, with 21 of these stars classified as mature solar-type stars, a result that increases by a factor of four the number of mature solar-type stars on which magnetic fields have been observed. In addition, a magnetic field was detected for 3 out of 18 of the subgiant stars surveyed. For the population of K-dwarfs the mean value of $B_{l}$ ($|B_{l}|_{mean}$) was also found to be higher (5.7 G) than $|B_{l}|_{mean}$ measured for the G-dwarfs (3.2 G) and the F-dwarfs (3.3 G). For the sample as a whole $|B_{l}|_{mean}$ increases with rotation rate and decreases with age, and the upper envelope for $|B_{l}|$ correlates well with the observed chromospheric emission. Stars with a chromospheric S-index greater than about 0.2 show a high magnetic field detection rate and so offer optimal targets for future studies. This survey constitutes the most extensive spectropolarimetric survey of cool stars undertaken to date, and suggests that it is feasible to pursue magnetic mapping of a wide range of moderately active solar-type stars to improve understanding of their surface fields and dynamos.
%G English
%Z Bcool
%2 https://hal.science/hal-01069245/document
%2 https://hal.science/hal-01069245/file/stu1663.pdf
%L hal-01069245
%U https://hal.science/hal-01069245
%~ IN2P3
%~ IRD
%~ OBSPM
%~ INSU
%~ METEO
%~ UNIV-PARIS7
%~ UNIV-SAVOIE
%~ UPMC
%~ UNIV-TLSE3
%~ UGA
%~ CNRS
%~ UNIV-GRENOBLE1
%~ UNIV-MONTP2
%~ INPG
%~ IRSTEA
%~ CNES
%~ OSUG
%~ LESIA
%~ OMP
%~ OMP-IRAP
%~ LUPM
%~ IPAG
%~ PSL
%~ AGREENIUM
%~ UPMC_POLE_2
%~ MIPS
%~ UNIV-MONTPELLIER
%~ SORBONNE-UNIVERSITE
%~ LUPM_AS
%~ SU-SCIENCES
%~ INRAE
%~ UNIV-PARIS
%~ UP-SCIENCES
%~ OBSPM-PSL
%~ USMB-COMUE
%~ SU-TI
%~ ALLIANCE-SU
%~ UNIV-UT3
%~ UT3-INP
%~ UT3-TOULOUSEINP
%~ UM1-UM2