J/MNRAS/425/1394ivo://CDS.VizieR/J/MNRAS/425/1394doi:10.26093/cds/vizier.74251394CDSKawka A.Vennes S.2024-07-18T20:19:03Z2014-12-17T13:05:25ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsproper-motionsphotometryWe conducted a spectropolarimetric survey of 58 high proper-motion white dwarfs which achieved uncertainties of >~2kG in the H{alpha} line and >~5kG in the upper Balmer line series. The survey aimed at detecting low magnetic fields (<~100kG) and helped identify the new magnetic white dwarfs NLTT2219, with a longitudinal field B_l_=-97kG, and NLTT10480 (B_l_=-212kG). Furthermore, we report the possible identification of a very low-field white dwarf with B_l_=-4.6kG. The observations show that ~~5 per cent of white dwarfs harbour low fields (~10 to ~10^2^kG) and that increased survey sensitivity may help uncover several new magnetic white dwarfs with fields below ~1kG. A series of observations of the high-field white dwarf NLTT12758 revealed changes in polarity occurring within an hour possibly associated with an inclined, fast rotating dipole. Also, the relative strength of the {pi} and {sigma} components in NLTT12758 possibly revealed the effect of a field concentration ('spot'), or, most likely, the presence of a non-magnetic white dwarf companion. Similar observations of NLTT13015 also showed possible polarity variations, but without a clear indication of the time-scale. The survey data also proved useful in constraining the chemical composition, age and kinematics of a sample of cool white dwarfs as well as in constraining the incidence of double degenerates.2012MNRAS.425.1394Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/425/1394CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/133/413 : BVRIJHK photometry of cool white dwarfs (Bergeron+, 2001)J/AJ/128/1825 : Photometry identification of cool white dwarfs (Kilic+, 2004)J/AJ/131/582 : Cool white dwarfs in the SDSS (Kilic+, 2006)J/ApJ/643/402 : Cool white dwarfs in the solar neighborhood (Kawka+, 2006)J/ApJS/190/77 : Detailed analysis of cool WDs in the SDSS (Kilic+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/425/1394https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/425/1394http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/425/1394https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/425/1394https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/425/1394http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/425/1394GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/425/1394/stars (Atmospheric parameters, magnetic fields and other properties of the white dwarfs (tables 2 and 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/425/1394/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/425/1394/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/425/1394/stars?GETtext/xml+votable180.050000true1.0429167-3.66905560.005555555555555556Cone search capability for table J/MNRAS/425/1394/table1 (VLT FORS observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/425/1394/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/425/1394/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/425/1394/table1?GETtext/xml+votable180.050000true1.0430833-3.66903890.0055555555555555566/316 4437 4504 17103 17177 17364 17393 17527 17568 17630 17658 17670 17922 17986 18742 19987 21151 21162 21220 21488 22496 22501 22547 22663 22678 22708 23793 24882 24912 25220 25552 25568 25634 25790 26860 26962 27966 34756 35614 35663 35670 35686 35701 35705 35752 35943 36154 36278 36418 36805 38211 39820 40372 43891 44179 46933 48329 485161.5062136169708525e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/425/1394?format=asciiOpticaldefaultJ/MNRAS/425/1394/starsAtmospheric parameters, magnetic fields and other properties of the white dwarfs (tables 2 and 4)LinesLinesmeta.id;spect.linerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDWD designation (HHMM-DDd)meta.idcharm_WD[AB] Multiplicity index on WDmeta.code.multipcharn_WDIndividual note on star (1)meta.notecharName?=- NLTT identification number (NLTT NNNNN)meta.id;meta.maincharprimarym_Name[AB] Multiplicity index on Namemeta.code.multipcharTeff[5300/14350] Effective temperatureKphys.temperature.effectiveinte_Teffrms uncertainty on TeffKstat.error;phys.temperature.effectiveintlogg[6.3/8.6] Surface gravitylog(cm.s**-2)phys.gravityfloate_loggrms uncertainty on logglog(cm.s**-2)stat.errorfloatn_logg[)] Uncertainty flag on loggmeta.notecharMass[0.1/1] Star masssolMassphys.massfloate_Massrms uncertainty on MasssolMassstat.error;phys.massfloatAgeStar ageGyrtime.agefloatVMAG[10/16] Absolute V magnitudemagphys.magAbs;em.opt.Vfloate_VMAGrms uncertainty on VMAGmagstat.errorfloatDist[17/204] Distancepcpos.distance;pos.heliocentricinte_Distrms uncertainty in Distpcstat.errorintNmNumber of optical and near-infrared magnitudes (tables A1 and A2)meta.numberintnullableNvNumber of velocity observations (table B1)meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharBl[-333/21] Longitudinal magnetic field (kGauss)dTphys.magFieldfloatnullablee_Blrms uncertainty on Bl (kGauss)dTstat.errorfloatnullable_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/425/1394/table1VLT FORS observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharm_NameMultiplicity index on Namemeta.code.multipcharONamesAlternate namesmeta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainPmag[15/18] Photographic magnitude (1)magphot.mag;em.optfloatpm[0.16/1.2] Total proper motionarcsec/yrpos.pmfloatDate1UT datetime.epochnullableN1Number of complete spectropolarimetric sequences for Date1meta.numberintDate2UT datetime.epochnullableN2? Number of complete spectropolarimetric sequences for Date2meta.numberintnullableDate3UT datetime.epochnullableN3? Number of complete spectropolarimetric sequences for Date3meta.numberintnullableDate4UT datetime.epochnullableN4? Number of complete spectropolarimetric sequences for Date4meta.numberintnullableDate5UT datetime.epochnullableN5? Number of complete spectropolarimetric sequences for Date5meta.numberintnullableJ/MNRAS/425/1394/tablea1Optical and infrared magnitudesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharm_NameMultiplicity index on Namemeta.code.multipcharVmag1? EFOSC V magnitudemagphot.mag;em.opt.VfloatnullableRmag1? EFOSC R magnitudemagphot.mag;em.opt.RfloatnullableVmag2? FORS V magnitudemagphot.mag;em.opt.VfloatnullableRmag2? FORS R magnitudemagphot.mag;em.opt.RfloatnullableVmag? Published V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatnullabler_Vmag? magnitude reference (1)meta.ref;pos.frameintnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.Jfloatnullablen_Jmag[b] b: Kilic et al. (2010ApJS..190...77K, J/ApJS/190/77) measured J=16.20+/-0.04meta.notecharJ/MNRAS/425/1394/tablea2SDSS photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNLTT identification number (NLTT NNNNN)meta.id;meta.maincharSDSSSDSS designation (JHHMMSS.ss+DDMMSS.s)meta.idcharumagSDSS u magnitudemagphot.mag;em.opt.Ufloate_umagrms uncertainty on umagmagstat.error;phot.mag;em.opt.UfloatgmagSDSS g magnitudemagphot.mag;em.opt.Bfloate_gmagrms uncertainty on gmagmagstat.error;phot.mag;em.opt.BfloatrmagSDSS r magnitudemagphot.mag;em.opt.Rfloate_rmagrms uncertainty on rmagmagstat.error;phot.mag;em.opt.RfloatimagSDSS i magnitudemagphot.mag;em.opt.Ifloate_imagrms uncertainty on imagmagstat.error;phot.mag;em.opt.IfloatzmagSDSS z magnitudemagphot.mag;em.opt.Ifloate_zmagrms uncertainty on zmagmagstat.error;phot.mag;em.opt.IfloatJ/MNRAS/425/1394/tableb1Individual radial velocity measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNLTT identification number (NLTT NNNNN)meta.id;meta.maincharm_Name[AB] Multiplicty index on NLTTmeta.code.multipcharBJDBarycentric Julian date (BJD-2450000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVrms uncertainty on RVkm/sstat.errorfloat