Article (Scientific journals)
A BCool magnetic snapshot survey of solar-type stars
Marsden, S.C.; Petit, P.; Jeffers, S.V. et al.
2014In Monthly Notices of the Royal Astronomical Society, 444, p. 3517
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Abstract :
[en] We present the results of a major high-resolution spectropolarimetric BCool project magnetic survey of 170 solar-type stars. Surface magnetic fields were detected on 67 stars, with 21 classified as mature solar-type stars, a result that increases by a factor of 4 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 |Bl| (|Bl|mean) was also found to be higher (5.7 G) than |Bl|mean measured for the G-dwarfs (3.2 G) and the F-dwarfs (3.3 G). For the sample as a whole, |Bl|mean increases with rotation rate and decreases with age, and the upper envelope for |Bl| 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 our understanding of their surface fields and dynamos.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Marsden, S.C.
Petit, P.
Jeffers, S.V.
Morin, J.
Fares, R.
Reiners, A.
do Nascimento, J.-D.
Aurière, M.
Bouvier, J.
Carter, B.D.
Catala, C.
Dintrans, B.D.
Donati, J.-F.
Gastine
Jardine, M.
Konstantinova-Antova, R.
Lanoux, J.
Lignières, F.
Morgenthaler, A.
Ramirez-Veles, J.C.
Théado, S.
Van Grootel, Valérie  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
More authors (12 more) Less
Language :
English
Title :
A BCool magnetic snapshot survey of solar-type stars
Publication date :
November 2014
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
444
Pages :
3517
Peer reviewed :
Peer Reviewed verified by ORBi
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since 25 September 2014

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