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A Bcool spectropolarimetric survey of over 150 solar-type stars

Published online by Cambridge University Press:  07 August 2014

Stephen Marsden ,
Pascal Petit ,
Sandra Jeffers ,
Jose-Dias do Nascimento ,
Bradley Carter  and
Carolyn Brown
Stephen Marsden
Affiliation:
Computational Engineering and Science Research Centre, University of Southern Queensland, Toowoomba, 4350, Australia email: Stephen.Marsden@usq.edu.au
Pascal Petit
Affiliation:
Université de Toulouse, UPS-OMP, Institut de Recherche en Astrophysique et Planétologie, Toulouse, France CNRS, Institut de Recherche en Astrophysique et Planétologie, 14 Avenue Edouard Belin, F-31400 Toulouse, France
Sandra Jeffers
Affiliation:
Institut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Jose-Dias do Nascimento
Affiliation:
Departamento de Fisica Teérica e Experimental, Universidade Federal do Rio Grande do Norte, CEP: 59072-970 Natal, RN, Brazil
Bradley Carter
Affiliation:
Computational Engineering and Science Research Centre, University of Southern Queensland, Toowoomba, 4350, Australia email: Stephen.Marsden@usq.edu.au
Carolyn Brown
Affiliation:
Computational Engineering and Science Research Centre, University of Southern Queensland, Toowoomba, 4350, Australia email: Stephen.Marsden@usq.edu.au
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Abstract

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As part of the Bcool project, over 150 solar-type stars chosen mainly from planet search databases have been observed between 2006 and 2013 using the NARVAL and ESPaDOnS spectropolarimeters on the Telescope Bernard Lyot (Pic du Midi, France) and the Canada France Hawaii Telescope (Mauna Kea, USA), respectively. These single “snapshot” observations have been used to detect the presence of magnetic fields on 40% of our sample, with the highest detection rates occurring for the youngest stars. From our observations we have determined the mean surface longitudinal field (or an upper limit for stars without detections) and the chromospheric surface fluxes, and find that the upper envelope of the absolute value of the mean surface longitudinal field is directly correlated to the chromospheric emission from the star and increases with rotation rate and decreases with age.

Keywords

line: profilesstars: activitystars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S302: Magnetic Fields throughout Stellar Evolution , August 2013 , pp. 138 - 141
Copyright
Copyright © International Astronomical Union 2014 

References

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