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  1. No Access

    Living Reference Work Entry In depth

    SPIRou: A nIR Spectropolarimeter/High-precision Velocimeter for the CFHT

    SPIRou is a near-infrared (nIR) spectropolarimeter/velocimeter for the Canada-France-Hawaii Telescope (CFHT) that will focus on two forefront science topics, (i) the quest for habitable Earthlike planets aroun...

    J.-F. Donati, D. Kouach, M. Lacombe, S. Baratchart, R. Doyon… in Handbook of Exoplanets

  2. No Access

    Chapter

    Magnetic Field and Convection in the Cool Supergiant Betelgeuse

    We present the outcome of a highly-sensitive search for magnetic fields on the cool supergiant Betelgeuse. A time-series of six circularly polarized spectra was obtained using the NARVAL spectropolarimeter at ...

    P. Petit, M. Aurière, R. Konstantinova-Antova… in The Environments of the Sun and the Stars (2013)

  3. No Access

    Chapter and Conference Paper

    High-Resolution Spectropolarimetry on the VLT

    We outline here the new and unique science avenues that a high-resolution visible and near infrared spectropolarimeter would allow us to explore. Such an instrument should lead to major advances in our underst...

    J.-F. Donati, C. Catala, G. Mathys… in Scientific Drivers for ESO Future VLT/VLTI… (2002)

  4. No Access

    Chapter

    Differential Rotation of Close Binary Stars: Application to HR 1099

    We propose a new method for estimating differentialrotation in binary stars, for which only moderate to poor phase coverage can be obtained (rotation period of order of a few days), preventing the use of conve...

    P. Petit, J. -F. Donati, G. A. Wade, J. D. Landstreet, J. M. Oliveira… in Astrotomography (2001)

  5. No Access

    Chapter

    Imaging the Magnetic Topologies of Cool Active Stars

    In the last decade, new indirect imaging techniques have been proposed to unveil the surface magnetic topologies of rapidly rotating active stars, which are found to be vastly different from that of the Sun. A...

    J. -F. Donati in Astrotomography (2001)

  6. No Access

    Chapter and Conference Paper

    First Results of the November 1996 MUSICOS Campaign on the 07.5III Star ξ Persei

    We present the first results of the MUSICOS campaign on the 07.5III star ξ Persei, held in November 1996, which was aimed to study its wind variability, rotation, pulsation and magnetic field in order to study th...

    H. Henrichs, J. de Jong, C. Catala, J.-F. Donati… in Cyclical Variability in Stellar Winds (1998)

  7. No Access

    Chapter and Conference Paper

    MUSICOS Observations of SU Aurigae

    We present results from the MUSICOS (MUlti-Slte COntinuous Spectroscopy) campaign 1996 on the classical T Tauri star SU Aurigae. Our observations support the suggestion that the wind and infall signatures are ...

    Yvonne C. Unruh, J.-F. Donati in Cyclical Variability in Stellar Winds (1998)

  8. No Access

    Chapter

    Magnetic Structures and Giant Flares in HR1099

    We describe results from the December 1989 multi-site continuous observing campaign (MUSICOS 89 with 17 telescopes around the globe) dedicated to the study of active structures and flares on the RS CVn system ...

    B. H. Foing, S. Char, T. Ayres, C. Catala… in Magnetodynamic Phenomena in the Solar Atmo… (1996)

  9. No Access

    Article

    Azimuthal structures in the wind and chromosphere of the herbig Ae star ab aur. preliminary results from the MUSICOS 1992 campaign

    MUSICOS (for MUlti-SIte COntinuous Spectroscopy) is an international project to facilitate and organize world-wide multi-site campaigns in high resolution spectroscopy, in view of obtaining a complete time cov...

    C. Catala, T. Böhm, J. -F. Donati, T. Simon, A. Welty, E. Houdebine… in Solar Physics (1994)

  10. No Access

    Chapter and Conference Paper

    Map** magnetic fields on rapidly rotating stars

    S. F. Brown, J. -F. Donati in Surface Inhomogeneities on Late-Type Stars (1992)

  11. No Access

    Chapter and Conference Paper

    Towards magnetic images of rapidly rotating late-type stars

    We present the first magnetic detections using Zeeman-Doppler Imaging (ZDI) in the two bright rapidly rotating RS CVn systems HR 1099 and σ 2 CrB, and discuss their compatibility with various recent results on ma...

    J. -F. Donati, M. Semel in The Sun and Cool Stars: activity, magnetism, dynamos (1991)

  12. No Access

    Article

    Zeeman-doppler imaging: A new option for magnetic field study of Ap and solar-type stars

    In the task of studying stellar magnetic fields, polarimetric methods have been intensively used in Ap stars. But the observational material classically used to reconstruct stellar magnetic structures (average...

    J. F. Donati, M. Semel in Solar Physics (1990)