| Instrument | |
| Instrument Name: | Narval |
| Telescope: | Telescope Bernard Lyot |
| Telescope Aperture: | 2m |
| Telescope Port: | |
| Status: | Operational |
| Commissioning Date: | |
| Polarimetry: | |
| Polarimetry Type: | spectro polarimetry |
| Stokes Parameters: | I Q U V |
| Wavelength Range: | 370-1000nm |
| Modulator Type: | Achromatic Rotating Retarder |
| Modulator Type Other: | Fresnel Rhombs |
| Modulation Frequency: | |
| Analyzer Type: | Wollaston Prism |
| Analyzer Type Other: | |
| Sensitivity: | 10-4 |
| Accuracy Zero Point: | |
| Accuracy Scaling: | |
| Imaging: | No |
| Wavelength Range: | |
| Field of View: | |
| Resolution: | |
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| Pixel Dimensions: | |
| Sensor Type: | |
| Limiting Magnitude: | |
| Coronograph: | |
| Coronograph Type: | |
| Coronograph IWA: | |
| Adaptive Optics: | No |
| DM, Number of Actuators: | |
| DM Type: | |
| WFS Type: | |
| WFS Update frequency: | |
| Strehl: | |
| Limiting Magnitude: | |
| Spectroscopy: | Yes |
| Sampling: | 2.4km/s |
| Wavelength Range: | 370-1000nm |
| Spectral Resolution: | 65000 |
| Limiting Magnitude: | 12 |
| Instrument Image: | |
| Instrument Image Caption: | |
| Instrument Reference Paper: | |
| Known Issues: | 1-3% crosstalk between Stokes parameters |
| Instrument Contact: | R. Cabanac |
| Instrument Website: | http://www.tbl.obs-mip.fr/INSTRUMENTATION2 (French) |
| Planned Upgrades: | Neo-Narval, stabilisation 3m/s |
| Science | |
| Science Description: | Stellar Magnetism |
| Target Types: | Stars |
| Sample Image/Result: | |
| Sample image Caption: | |
| Sample Science Papers: | Donati, JF, et al., 2008, Magnetospheric accretion on the T Tauri star BP Tauri, 2008MNRAS.386.1234 Donati, JF, et al., 2008, Large-scale magnetic topologies of early M dwarfs, 2008MNRAS.390..545D , Aurière, M., et al., 2007, Weak magnetic fields in Ap/Bp stars. Evidence for a dipole field lower limit and a tentative interpretation of the magnetic dichotomy, 2007A&A...475.1053A , Donati, JF., et al. 2008, Magnetic cycles of the planet-hosting star τ Bootis, 2008MNRAS.385.1179D, Donati, JF., et al., 2010, Magnetospheric accretion and spin-down of the prototypical classical T Tauri star AA Tau, 2010MNRAS.409.1347D, Aurière, M., et al., 2009, Discovery of a weak magnetic field in the photosphere of the single giant Pollux, 2009A&A...504..231A, Lignières, F., et al., 2009, First evidence of a magnetic field on Vega. Towards a new class of magnetic A-type stars, 2009A&A...500L..41L, Aurière, M., et al., 2008, EK Eridani: the tip of the iceberg of giants which have evolved from magnetic Ap stars,2008A&A...491..499A, Aurière, M., et al., 2010, The magnetic field of Betelgeuse: a local dynamo from giant convection cells?, 2010A&A...516L...2A , Fares, R., et al., 2009 Magnetic cycles of the planet-hosting star τ Bootis - II. A second magnetic polarity reversal, 2009MNRAS.398.1383F, Alecian, E., et al., 2008 Characterization of the magnetic field of the Herbig Be star HD200775, 2008MNRAS.385..391A, Bouret, JC, et al., 2008 The weak magnetic field of the O9.7 supergiant ζOrionisA,2008MNRAS.389...75B, Martins, F, et al., 2010, Detection of a magnetic field on HD108: clues to extreme magnetic braking and the O phenomenon, 2010MNRAS.407.1423M, Silvester, J., et al., 2009, On the incidence of magnetic fields in slowly pulsating B, β Cephei and B-type emission-line stars, 2009MNRAS.398.1505S, Fares, R., et al., 2010, Searching for star-planet interactions within the magnetosphere of HD189733, 2010MNRAS.406..409F |
| Remarks: | |