J/MNRAS/390/545ivo://CDS.VizieR/J/MNRAS/390/545doi:10.26093/cds/vizier.73900545CDSDonati J.-F.Morin J.Petit P.Delfosse X.Forveille T.Auriere M.,Cabanac R.Dintrans B.Fares R.Gastine T.Jardine M.M.Lignieres F.,Paletou F.Ramirez Velez J.C.Theado S.2024-07-07T20:17:09Z2010-07-27T16:31:38ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frm-starsmagnetic-fieldsWe 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 in stars on both sides of the full convection threshold (spectral type M4). The present paper focuses on early M stars (M0-M3), that is above the full convection threshold. Applying tomographic imaging techniques to time series of rotationally modulated circularly polarized profiles collected with the NARVAL spectropolarimeter, we determine the rotation period and reconstruct the large-scale magnetic topologies of six early M dwarfs. We find that early-M stars preferentially host large-scale fields with dominantly toroidal and non-axisymmetric poloidal configurations, along with significant differential rotation (and long-term variability); only the lowest-mass star of our subsample is found to host an almost fully poloidal, mainly axisymmetric large-scale field resembling those found in mid-M dwarfs.2008MNRAS.390..545Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/390/545CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/cfht : Log of CFHT Exposures (CADC, 1979-)I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997)J/A+A/331/581 : Rotation and activity in field M dwarfs (Delfosse+ 1998)J/A+A/417/651 : NEXXUS ROSAT survey of coronal X-ray (Schmitt+ 2004)J/MNRAS/390/567 : Magnetic topologies of mid M dwarfs (Morin+, 2008)J/MNRAS/407/2269 : Magnetic topologies of late M dwarfs (Morin+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/390/545https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/390/545http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/390/545https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/390/545https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/390/545http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/390/545GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/390/545/table1 (Fundamental parameters of our sample early-M dwarf stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/390/545/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/390/545/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/390/545/table1?GETtext/xml+votable180.050000true74.89513671.78352280.0055555555555555566/3715 8440 8627 22964 26555 28341https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/390/545?format=asciidefaultJ/MNRAS/390/545/table1Fundamental parameters of our sample early-M dwarf starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameDesignations of the starmeta.idcharprimarySNameGJ namemeta.idcharSpTMK spectral typesrc.spTypecharMassMass of the star (1)solMassphys.massfloatLbolLogarithmic bolometric luminosity (2)log(1e-07W)phys.luminosityfloatl_LX/LbolLimit flag on LX/Lbolmeta.code.errorcharLX/LbolRatio of X-ray to bolometric luminosity (3)phys.luminosity;arith.ratiofloatvsiniEquatorial rotational velocity along line of sight (this paper, accuracy ~1km/s)km/sphys.veloc.rotatintProtRotation period (this paper)dtime.periodfloattaucConvective turnover time (4)dtime.epochintRoRossby number (Prot/tauc)stat.paramfloatRadTheoretical stellar radius (5)solRadphys.size.radiusfloatiInclination of the stellar rotation axis (this paper)degphys.angSizeintplotplot of the longitudinal magnetic field variationsmeta.ref.urlcharSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/390/545/tablesDates, magnetic field and radial velocity (tables 2-7 of the paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameDesignation of the starmeta.id;phys.atmol.configurationcharObsUT date of observationstime.epoch;obsnullableHJDUT heliocentric Julian date of observationdtime.epochdoubleTexpExposure time (NxNNN in s)time.duration;obs.exposurecharS/NSignal to noise ratio (1)stat.snrintsigmarms noise level of V profile (2)instr.det.noisefloatERotation cycle (3)meta.number;time.periodfloatBlLongitudinal magnetic field (Gauss)0.0001Tphys.magFieldfloate_Blrms uncertainty on Bl0.0001Tstat.errorfloatRVRadial velocity (4)km/sphys.veloc;pos.heliocentricfloat