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Large-scale magnetic topologies of late M dwarfs⋆
- J. Morin, J. Donati, S. Th'eado
- Physics
- 10 August 2008
We present here the final results of the first spectropolarimetric survey of a small sample of active M dwarfs, aimed at providing observational constraints on dynamo action on both sides of the…
Magnetospheric accretion on the T Tauri star BP Tauri
- J. Donati, M. Jardine, E. Alecian
- Physics
- 14 February 2008
From observations collected with the ESPaDOnS and NARVAL spectropolarimeters, we report the detection of Zeeman signatures on the classical T Tauri star BP Tau. Circular polarisation signatures in…
Weak magnetic fields in Ap/Bp stars - Evidence for a dipole field lower limit and a tentative interp
- M. Aurière, G. Wade, N. Toqué
- Physics
- 8 October 2007
Aims. We investigated a sample of 28 well-known spectroscopically-identified magnetic Ap/Bp stars, with weak, poorly-determined or previously undetected magnetic fields. The aim of this study is to…
Toroidal versus poloidal magnetic fields in Sun-like stars: a rotation threshold
- P. Petit, B. Dintrans, R. Fares
- Physics
- 8 April 2008
From a set of stellar spectropolarimetric observations, we report the detection of surface magnetic fields in a sample of four solar-type stars, namely HD 73350, HD 76151, HD 146233 (18 Sco) and HD…
Large-scale magnetic topologies of early M dwarfs
- J. Donati, J. Morin, S. Th'eado
- Physics
- 1 September 2008
We present here additional results of a spectropolarimetric survey of a small sample of stars ranging from spectral type M0 to M8 aimed at investigating observationally how dynamo processes operate…
First evidence of a magnetic field on Vega Towards a new class of magnetic A-type stars ⋆
- F. Lignières, P. Petit, T. Bohm, M. Aurière
- Physics
- 6 March 2009
Aims. We report the detection of a magnetic field on Vega through spe ctropolarimetric observations. Methods. We acquired 257 Stokes V, high signal-to-noise and high-resolution echelle spectra during…
A BCool magnetic snapshot survey of solar-type stars
- S. Marsden, P. Petit, the Bcool Collaboration
- Physics
- 14 November 2013
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…
Magnetospheric accretion and spin‐down of the prototypical classical T Tauri star AA Tau
- J. Donati, M. Skelly, R. collaboration
- Physics
- 26 July 2010
From observations collected with the ESPaDOnS spectropolarimeter at the Canada-France-Hawaii Telescope (CFHT) and with the NARVAL spectropolarimeter at the Telescope Bernard Lyot (TBL), we report the…
The Magnetic Fields at the Surface of Active Single G-K Giants
- M. Aurière, R. Konstantinova-Antova, J. Zahn
- Physics
- 23 November 2014
We investigate the magnetic field at the surface of 48 red giants selected as promising for detection of Stokes V Zeeman signatures in their spectral lines. We use the spectropolarimeters Narval and…
Detection of a weak surface magnetic field on Sirius A: are all tepid stars magnetic?
- P. Petit, F. Lignières, S. Th'eado
- Physics
- 27 June 2011
Aims. We aim at a highly sensitive search for weak magnetic fields in main sequence stars of intermediate mass, by scanning classes of stars with no previously reported magnetic members. After…
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