J/A+A/677/A144ivo://CDS.VizieR/J/A+A/677/A144doi:10.26093/cds/vizier.36770144CDSBlinov D.Maharana S.Bouzelou F.Casadio C.Gjerlow E.,Jormanainen J.Kiehlmann S.Kypriotakis J.A.Liodakis I.Mandarakas N.,Markopoulioti L.Panopoulou G.V.Pelgrims V.Pouliasi A.,Romanopoulos S.Skalidis R.Anche R.M.Angelakis E.Antoniadis J.,Medhi B.J.Hovatta T.Kus A.Kylafis N.Mahabal A.Myserlis I.,Paleologou E.Papadakis I.Pavlidou V.Papamastorakis I.Pearson T.J.,Potter S.B.Ramaprakash A.N.Readhead A.C.S.Reig P.Slowikowska A.,Tassis K.Zensus J.A.2024-11-06T20:05:49Z2024-03-04T14:34:50ZCDS support team

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

cds-question@unistra.frstandard-starspolarimetryvisible-astronomyOptical polarimeters are typically calibrated using measurements of stars with known and stable polarization parameters. However, there is a lack of such stars available across the sky. Many of the currently available standards are not suitable for medium and large telescopes due to their high brightness. Moreover, as we find, some of the polarimetric standards used are in fact variable or have polarization parameters that differ from their cataloged values. Our goal is to establish a sample of stable standards suitable for calibrating linear optical polarimeters with an accuracy down to 10^-3^ in fractional polarization. For 4yr, we have been running a monitoring campaign of a sample of standard candidates comprised of 107 stars distributed across the northern sky. We analyzed the variability of the linear polarization of these stars, taking into account the non-Gaussian nature of fractional polarization measurements. For a subsample of nine stars, we also performed multiband polarization measurements. We created a new catalog of 65 stars (see table 2) that are stable, have small uncertainties of measured polarimetric parameters, and can be used as calibrators of polarimeters at medium and large telescopes.2023A&A...677A.144Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/677/A144CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/677/A144https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/677/A144http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/677/A144https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/677/A144https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/677/A144http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/677/A144GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/677/A144/table2 (Average polarization parameters of stable (2{sigma} S.L.) stars in the established standards sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/677/A144/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/677/A144/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/677/A144/table2?GETtext/xml+votable180.050000true13.56733330.66527780.005555555555555556Cone search capability for table J/A+A/677/A144/tablea1 (Standards candidates information)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/677/A144/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/677/A144/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/677/A144/tablea1?GETtext/xml+votable180.050000true3.990041781.61572220.0055555555555555566/60 514 861 1053 3087 4027 4504 5396 6183 7656 7673 8047 8054 8153 10345 10433 10456 10822 10896 11768 11989 11992 12048 13927 14353 15670 15969 16184 16223 16272 17749 17840-17841 18028 18774 18801 19033 19095 20099 21756 22121 22869 22938 23148 23765 25751 25946 26174 26477 26604 26916 27045 27324 27900 28079 28453 28499 28551 28609-28610 30012 30043 30121 30123 30357 31064 31380 31595 31894 31919 322611.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/677/A144?format=asciiOpticaldefaultJ/A+A/677/A144/table2Average polarization parameters of stable (2{sigma} S.L.) stars in the established standards sampleIDStar identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainqWeighted average Q/I relative Stokes parameter corrected for the instrumental polarization and EVPA zero-pointphys.polarization.stokes;stat.meanfloate_qError on weighted average Q/I relative Stokes parameterstat.errorfloatGmagGaia DR3 G magnitudemagphot.mag;em.optfloatuWeighted average U/I relative Stokes parameter corrected for the instrumental polarization and EVPA zero-pointphys.polarization.stokes;stat.meanfloate_uError on eighted average U/I relative Stokes parameterstat.errorfloatJ/A+A/677/A144/tablea1Standards candidates informationSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifiermeta.id;meta.maincharONameAlternative identifiermeta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainGaiaEDR3Gaia EDR3 idmeta.idrpmag? Synthetic SDSS r' magnitude from Gaia Collaboration et al. (2022)magphot.mag;em.opt.RfloatnullableGmagGaia EDR3 G-band magnitudemagphot.mag;em.optfloatSpTypeSpectral typesrc.spTypecharSample[BLHZ] Samplesrc.samplecharNrbandNumber of observations in the SDSS-r bandmeta.numberintNRbandNumber of observations in the Cousins-R bandmeta.numberintJ/A+A/677/A144/tablea3Multiband single epoch measurements with ALFOSC/NOT for 9 starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifiermeta.id;meta.maincharBand[UBVRgri] Observed bandinstr.bandpasscharqRelative Stokes parameter Q/Iphys.polarization.stokesdoublee_qRelative Stokes parameter Q/I errorstat.errordoubleuRelative Stokes parameter U/Iphys.polarization.stokesdoublee_uRelative Stokes parameter U/I errorstat.errordoublePDFractional polarization%phys.polarizationdoublee_PDFractional polarization error%stat.errordoubleEVPAElectric vector position angledegpos.posAngdoublee_EVPAElectric vector position angle errordegstat.errordoubleJ/A+A/677/A144/tablea4Average polarization parameters of the starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifiermeta.id;meta.maincharNmeasNumber of measurementsmeta.numberintPDMean of the fractional polarization%phys.polarizationfloate_PDMean of the fractional polarization error%stat.errorfloatEVPAMean of the electric vector position angledegpos.posAngfloate_EVPAMean of the electric vector position angle errordegstat.errorfloatqRelative Stokes parameter Q/Iphys.polarization.stokesdoublee_qRelative Stokes parameter Q/I errorstat.errordoubleuRelative Stokes parameter U/Iphys.polarization.stokesdoublee_uRelative Stokes parameter U/I errorstat.errordoubleVarFlagVariability flag for 2{sigma} S.L. (1)meta.code;src.varcharpvalue? p valuestat.fit.goodnessdoublenullable