J/ApJ/709/1306ivo://CDS.VizieR/J/ApJ/709/1306doi:10.26093/cds/vizier.17091306CDSWisniewski J.P.Draper Z.H.Bjorkman K.S.Meade M.R.Bjorkman J.E.,Kowalski A.F.2017-07-05T07:00:06Z2012-04-02T12:54:27ZCDS support team

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

cds-question@unistra.frbe-starsline-intensitiespolarimetryClassical Be stars are known to occasionally transition from having a gaseous circumstellar disk ("Be phase") to a state in which all observational evidence for the presence of these disks disappears ("normal B-star phase"). We present one of the most comprehensive spectropolarimetric views to date of such a transition for two Be stars, {pi} Aquarii and 60 Cygni. The disk-loss episode of 60 Cyg was characterized by a generally monotonic decrease in emission strength over a timescale of ~1000 days from the maximum V-band polarization to the minimum H{alpha} equivalent width, consistent with the viscous timescale of the disk, assuming {alpha}~0.14. {pi} Aqr's disk loss was episodic in nature and occurred over a timescale of ~2440 days.2010ApJ...709.1306Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/709/1306CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/226 : Stellar polarization catalogs agglomeration (Heiles, 2000)II/220 : Polarisation of Be stars (McDavid, 1986-1999)J/ApJS/187/228 : H{alpha} profiles of Be stars (Silaj+, 2010)J/A+A/368/912 : Polarization and rotational velocities of Be stars (Yudin,J/A+A/378/861 : Spectroscopy of Be stars (Chauville+, 2001)J/PASP/106/949 : Multicolor polarimetry of Be stars (McDavid, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/709/1306https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/709/1306http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/709/1306https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/709/1306https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/709/1306http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/709/1306GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/709/1306/table1Summary of 60 Cyg datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of the observationtime.epoch;obsnullableJDJulian Date of the observationdtime.epochintObsFacility code (1)meta.codecharf_Obs[1,4]? Flag on Obs (2)meta.codeintnullableEW.Ha? H{alpha} equivalent width; in Angstroms0.1nmspect.line.eqWidth;em.line.Halphafloatnullablee_EW.Ha? Uncertainty in EW.Ha0.1nmstat.error;spect.line.eqWidthfloatnullableVPol? V band polarization%phys.polarization.linearfloatnullablee_VPol? Uncertainty in VPol%stat.errorfloatnullablePA? Polarization position angledegpos.posAng;phys.polarizationfloatnullableState[H/L]? Polarization state (3)meta.codecharJ/ApJ/709/1306/table2Summary of {pi} Aqr datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of the observationtime.epoch;obsnullableJDJulian Date of the observationdtime.epochintObsFacility code (1)meta.codecharf_Obs[1,4]? Flag on Obs (2)meta.codeintnullableEW.Ha? H{alpha} equivalent width; in Angstroms0.1nmspect.line.eqWidth;em.line.Halphafloatnullablee_EW.Ha? Uncertainty in EW.Ha0.1nmstat.error;spect.line.eqWidthfloatnullableVPol? V band polarization%phys.polarization.linearfloatnullablee_VPol? Uncertainty in VPol%stat.errorfloatnullablePA? Polarization position angledegpos.posAng;phys.polarizationfloatnullableState[H/L]? Polarization state (3)meta.codechar