J/AJ/134/1877ivo://CDS.VizieR/J/AJ/134/1877doi:10.26093/cds/vizier.51341877CDSKawabata K.S.Ikeda Y.Akitaya H.Isogai M.Matsuda K.Matsumura M.,Nagae O.Seki M.2017-06-27T06:37:28Z2010-03-07T13:18:07ZCDS support team

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

cds-question@unistra.frvariable-starspolarimetryWe present an extended optical spectropolarimetry of R CrB from 1998 January to 2003 September. The polarization was almost constant in the phase of maximum brightness, being consistent with past observations. We detected, however, temporary changes of the polarization (~0.5%) in 2001 March and August, which were the first detections of large polarization variability in R CrB near maximum brightness. The amplitude and the position angle of the "transient polarization" were almost constant with wavelength in both events. There was a difference of about 20{deg} in the position angle between the two events. Each event could be explained by light scattering due to a short-lived dust puff occasionally ejected off the line of sight.2007AJ....134.1877Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/134/1877CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/353/287 : The R CrB stars (Asplund+, 2000)J/A+A/394/617 : UBVJHKLM photometry of R Corona Borealis (Yudin+, 2002)J/A+A/412/405 : Polarimetry of evolved stars. III. (Yudin+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/134/1877https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/134/1877http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/134/1877https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/134/1877https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/134/1877http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/134/1877GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/134/1877/table1Polarimetry of R CrBrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsDateDate of the observationtime.epoch;obsnullableJDJulian datedtime.epochdoubleDVmagChange from normal V magnitude of 6.11mag (1)magphot.mag;em.opt.VfloatExptimeExposure timestime.duration;obs.exposureintEW? Equivalent width of C_2_ (5165{AA}) (5)0.1nmspect.line.eqWidthintnullablePobsObserved polarization in the V band (6)%phys.polarization;em.opt.Vfloate_PobsUncertainty in Pobs%stat.errorfloatPAobsObserved polarization angle in the V band (6)degphys.polarization;em.opt.Vfloate_PAobsUncertainty in PAobsdegstat.errorfloatPvarVariable component polarization in the V band%phys.polarization;em.opt.Vfloate_PvarUncertainty in Pvar%stat.errorfloatPAvarVariable component polarization angle in the V banddegphys.polarization;em.opt.Vfloate_PAvarUncertainty in PAvardegstat.errorfloatFpolPolarized flux fraction (7)phot.flux;arith.ratiointe_FpolUncertainty in Fpolstat.errorfloatTelTelescope code (2)meta.code;instr.telcharApAperture description code (3)meta.code;phys.angSizecharCCDCCD, as T=TI CCD, or S = SITe CCDobs.fieldchar