J/ApJ/786/120ivo://CDS.VizieR/J/ApJ/786/120doi:10.26093/cds/vizier.17860120CDSDraper Z.H.Wisniewski J.P.Bjorkman K.S.Meade M.R.Haubois X.,Mota B.C.Carciofi A.C.Bjorkman J.E.2017-08-22T08:35:42Z2017-07-13T15:30:57ZCDS support team

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

cds-question@unistra.frbe-starsstellar-spectral-typeseffective-temperaturepolarimetryline-intensitiesRecent observational and theoretical studies of classical Be stars have established the utility of polarization color diagrams (PCDs) in helping to constrain the time-dependent mass decretion rates of these systems. We expand on our pilot observational study of this phenomenon, and report the detailed analysis of a long-term (1989-2004) spectropolarimetric survey of nine additional classical Be stars, including systems exhibiting evidence of partial disk-loss/disk-growth episodes as well as systems exhibiting long-term stable disks. After carefully characterizing and removing the interstellar polarization along the line of sight to each of these targets, we analyze their intrinsic polarization behavior. We find that many steady-state Be disks pause at the top of the PCD, as predicted by theory. We also observe sharp declines in the Balmer jump polarization for later spectral type, near edge-on steady-state disks, again as recently predicted by theory, likely caused when the base density of the disk is very high, and the outer region of the edge-on disk starts to self absorb a significant number of Balmer jump photons. The intrinsic V-band polarization and polarization position angle of {gamma} Cas exhibits variations that seem to phase with the orbital period of a known one-armed density structure in this disk, similar to the theoretical predictions of Halonen & Jones. We also observe stochastic jumps in the intrinsic polarization across the Balmer jump of several known Be+sdO systems, and speculate that the thermal inflation of part of the outer region of these disks could be responsible for producing this observational phenomenon. Finally, we estimate the base densities of this sample of stars to be between ~8x10^-11^ and ~4x10^-12^ g/cm^3^ during quasi steady state periods given there maximum observed polarization.2014ApJ...786..120Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/786/120CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/220 : Polarisation of Be stars (McDavid, 1986-1999)J/PASP/106/949 : Multicolor polarimetry of Be stars (McDavid, 1994)J/A+A/368/912 : Polarization and rotational velocities of Be starsJ/A+A/440/305 : Fundamental parameters of fast-rotating B starsJ/A+A/459/137 : Bright Be shell stars (Rivnius+, 2006)J/ApJ/709/1306 : Spectropolarimetry of 60 Cyg and {pi} AqrJ/other/BASI/39.517 : Spectroscopy of classical Be stars (Mathew+, 2011)J/A+A/550/A79 : H{alpha} and H{beta} lines of northern Be starsJ/ApJ/768/128 : K-band calibrated visibilities of 24 Be starshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/786/120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/786/120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/786/120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/786/120https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/786/120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/786/120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/786/120/table1 (Target Star Summary)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/786/120/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/786/120/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/786/120/table1?GETtext/xml+votable180.050000true239.5473694-14.27935810.0055555555555555566/1769 2884 3030 14631 15372 15375 19202 22911 31759 39922 44502https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/786/120?format=asciiOpticaldefaultJ/ApJ/786/120/table2Raw HPOL DatarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNameTarget identifiermeta.idcharJDJulian Date of observationdtime.epochdoubleQRaw V band Q polarization%phys.polarization;em.opt.VfloatURaw V band U polarization%phys.polarization;em.opt.VfloatErrorError in the polarization%stat.errorfloatEWH{alpha} equivalent width; Angstroms0.1nmspect.line.eqWidth;em.line.HalphafloatJ/ApJ/786/120/table1Target Star SummaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget identifiermeta.id;meta.maincharSpTypeSpectral type (1)src.spTypecharTeffEffective temperaturedegphys.temperature.effectiveinte_Teff? Uncertainty in Teffdegstat.error;phys.temperature.effectiveintnullabler_Teff[1/3] Teff reference (2)meta.ref;pos.frameintl_Inc1[~] Limit flag on Inc1meta.code.errorcharInc1? Disk inclinationdegsrc.orbital.inclinationchare_Inc1? Uncertainty in Inc1degstat.errorintnullabler_Inc1Inc1 reference(s) (3)meta.ref;pos.framecharInc2? Disk inclinationdegsrc.orbital.inclinationintnullabler_Inc2[6]? Inc2 reference (3)meta.ref;pos.frameintnullableHPOLRet[2/53] Number of HPOL Reticon Nightsmeta.numberintHPOLCCD[3/57] Number of HPOL CCD Nightsmeta.numberintWUPPEWisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE) observation ? (4)meta.code;obscharSNameShort name used in tables 2 and 5meta.idcharRPRaw HPOL polarisation curvesmeta.ref.urlcharIPIntrinsic polarisation curvesmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_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/ApJ/786/120/table5Intrinsic PolarizationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNameTarget identifiermeta.idcharJDJulian Date of observationdtime.epochdoubleQIntrinsic V band Q polarization%phys.polarization;em.opt.VfloatUIntrinsic V band U polarization%phys.polarization;em.opt.VfloatErrorError in the polarization%stat.errorfloat