J/PASP/106/949ivo://CDS.VizieR/J/PASP/106/949doi:10.26093/cds/vizier.61060949CDSMcDavid D.2025-09-09T14:11:55Z1997-12-09T21:45:50ZCDS support team

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

cds-question@unistra.frbe-starsinfrared-photometryvisible-astronomybroad-band-photometrypolarimetryOptical polarization data in the UBVRI filter system for eight bright northern Be stars are presented here as the continuation of a long-term monitoring project begun in 1984. There are no strong cases of night-to-night variability, and the only star showing unmistakable changes in polarization from year to year over the nine years covered by the program is Pi Aquarii. Even though the observed sample spans a wide range in spectral type, vsini, and degree of intrinsic polarization, the normalized wavelength dependence of the polarization is surprisingly similar for all of the stars. Analysis of the wavelength dependence of the variable polarization of {pi} Aqr in terms of a simple equatorial-disk model suggests that changes in the circumstellar electron number density alone may be sufficient to account for the observations, but it is not clear what real physical mechanism is involved. Addresses: McDavid D. mcdavid@pinet.aip.org Limber Observatory, Timber Creek Road, P.O. Box 63599, Pipe Creek,Texas 78063 Explanatory Note: Tables 3-12 include data from two previous publications: McDavid, D. 1986PASP...98..572M and McDavid, D. 1990PASP..102..773M.1994PASP..106..949Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/106/949CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/106/949https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/106/949http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/106/949https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/106/949https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/106/949http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/106/949GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/PASP/106/949/table1Program Be starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharHDHD (Cat. <III/135>) catalog numbermeta.idintHRBS (Cat. <V/50>) catalog numbermeta.idintVmagVisual magnitude (BSC4, See Cat. <V/50>)magphot.mag;em.opt.VfloatSpSpectral type (1)src.spTypecharvsinivsini (1)km/sphys.veloc.rotatintJ/PASP/106/949/table2Filter system parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPassbandFilter system passbandmeta.notecharWavelengthEffective wavelengthnmem.wlfloatFWHMBandpassnminstr.bandwidthfloatJ/PASP/106/949/table3Polarization of 2H Cam (standard star)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonthMonth of observationstime.epochintYear-1900Year (offset 1900) of observationyrtime.epochintPassband[UBVRI] Filter system passbandmeta.notecharnobs[]? Number of observationsmeta.numberintq[]? Mean normalized Stokes parameter q%phys.polarization.stokesfloate_q[]? rms uncertainty on q%stat.errorfloatu[]? Mean normalized Stokes parameter u%phys.polarization.stokesfloate_u[]? rms uncertainty on u%stat.errorfloatpMean degree of polarization%phys.polarizationfloate_p[]? rms uncertainty on p%stat.errorfloatthetaMean equatorial position angledegpos.posAngfloate_theta[]? rms uncertainty on thetadegstat.errorfloatdpi[]? Instrumental precision of q, u, or p (1)%instr.precisionfloatdthetai[]? Instrumental precision of theta (2)degstat.error;instrfloatJ/PASP/106/949/table4Polarization of {omicron} Sco (standard star)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonthMonth of observationstime.epochintYear-1900Year (offset 1900) of observationyrtime.epochintPassband[UBVRI] Filter system passbandmeta.notecharnobs[]? Number of observationsmeta.numberintq[]? Mean normalized Stokes parameter q%phys.polarization.stokesfloate_q[]? rms uncertainty on q%stat.errorfloatu[]? Mean normalized Stokes parameter u%phys.polarization.stokesfloate_u[]? rms uncertainty on u%stat.errorfloatpMean degree of polarization%phys.polarizationfloate_p[]? rms uncertainty on p%stat.errorfloatthetaMean equatorial position angledegpos.posAngfloate_theta[]? rms uncertainty on thetadegstat.errorfloatdpi[]? Instrumental precision of q, u, or p (1)%instr.precisionfloatdthetai[]? Instrumental precision of theta (2)degstat.error;instrfloatJ/PASP/106/949/table5Polarization of {gamma} CasrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonthMonth of observationstime.epochintYear-1900Year (offset 1900) of observationyrtime.epochintPassband[UBVRI] Filter system passbandmeta.notecharnobs[]? Number of observationsmeta.numberintq[]? Mean normalized Stokes parameter q%phys.polarization.stokesfloate_q[]? rms uncertainty on q%stat.errorfloatu[]? Mean normalized Stokes parameter u%phys.polarization.stokesfloate_u[]? rms uncertainty on u%stat.errorfloatpMean degree of polarization%phys.polarizationfloate_p[]? rms uncertainty on p%stat.errorfloatthetaMean equatorial position angledegpos.posAngfloate_theta[]? rms uncertainty on thetadegstat.errorfloatdpi[]? Instrumental precision of q, u, or p (1)%instr.precisionfloatdthetai[]? Instrumental precision of theta (2)degstat.error;instrfloatJ/PASP/106/949/table6Polarization of {phi} PerrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonthMonth of observationstime.epochintYear-1900Year (offset 1900) of observationyrtime.epochintPassband[UBVRI] Filter system passbandmeta.notecharnobs[]? Number of observationsmeta.numberintq[]? Mean normalized Stokes parameter q%phys.polarization.stokesfloate_q[]? rms uncertainty on q%stat.errorfloatu[]? Mean normalized Stokes parameter u%phys.polarization.stokesfloate_u[]? rms uncertainty on u%stat.errorfloatpMean degree of polarization%phys.polarizationfloate_p[]? rms uncertainty on p%stat.errorfloatthetaMean equatorial position angledegpos.posAngfloate_theta[]? rms uncertainty on thetadegstat.errorfloatdpi[]? Instrumental precision of q, u, or p (1)%instr.precisionfloatdthetai[]? Instrumental precision of theta (2)degstat.error;instrfloatJ/PASP/106/949/table7Polarization of 48 PerrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonthMonth of observationstime.epochintYear-1900Year (offset 1900) of observationyrtime.epochintPassband[UBVRI] Filter system passbandmeta.notecharnobs[]? Number of observationsmeta.numberintq[]? Mean normalized Stokes parameter q%phys.polarization.stokesfloate_q[]? rms uncertainty on q%stat.errorfloatu[]? Mean normalized Stokes parameter u%phys.polarization.stokesfloate_u[]? rms uncertainty on u%stat.errorfloatpMean degree of polarization%phys.polarizationfloate_p[]? rms uncertainty on p%stat.errorfloatthetaMean equatorial position angledegpos.posAngfloate_theta[]? rms uncertainty on thetadegstat.errorfloatdpi[]? Instrumental precision of q, u, or p (1)%instr.precisionfloatdthetai[]? Instrumental precision of theta (2)degstat.error;instrfloatJ/PASP/106/949/table8Polarization of {zeta} TaurecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonthMonth of observationstime.epochintYear-1900Year (offset 1900) of observationyrtime.epochintPassband[UBVRI] Filter system passbandmeta.notecharnobs[]? Number of observationsmeta.numberintq[]? Mean normalized Stokes parameter q%phys.polarization.stokesfloate_q[]? rms uncertainty on q%stat.errorfloatu[]? Mean normalized Stokes parameter u%phys.polarization.stokesfloate_u[]? rms uncertainty on u%stat.errorfloatpMean degree of polarization%phys.polarizationfloate_p[]? rms uncertainty on p%stat.errorfloatthetaMean equatorial position angledegpos.posAngfloate_theta[]? rms uncertainty on thetadegstat.errorfloatdpi[]? Instrumental precision of q, u, or p (1)%instr.precisionfloatdthetai[]? Instrumental precision of theta (2)degstat.error;instrfloatJ/PASP/106/949/table9Polarization of 48 Libe_u[]? rms uncertainty on u%stat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonthMonth of observationstime.epochintYear-1900Year (offset 1900) of observationyrtime.epochintPassband[UBVRI] Filter system passbandmeta.notecharnobs[]? Number of observationsmeta.numberintq[]? Mean normalized Stokes parameter q%phys.polarization.stokesfloate_q[]? rms uncertainty on q%stat.errorfloatu[]? Mean normalized Stokes parameter u%phys.polarization.stokesfloatpMean degree of polarization%phys.polarizationfloate_p[]? rms uncertainty on p%stat.errorfloatthetaMean equatorial position angledegpos.posAngfloate_theta[]? rms uncertainty on thetadegstat.errorfloatdpi[]? Instrumental precision of q, u, or p (1)%instr.precisionfloatdthetai[]? Instrumental precision of theta (2)degstat.error;instrfloatJ/PASP/106/949/table10Polarization of {chi} OphrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonthMonth of observationstime.epochintYear-1900Year (offset 1900) of observationyrtime.epochintnobs[]? Number of observationsmeta.numberintq[]? Mean normalized Stokes parameter q%phys.polarization.stokesfloate_q[]? rms uncertainty on q%stat.errorfloatu[]? Mean normalized Stokes parameter u%phys.polarization.stokesfloate_u[]? rms uncertainty on u%stat.errorfloatpMean degree of polarization%phys.polarizationfloate_p[]? rms uncertainty on p%stat.errorfloatthetaMean equatorial position angledegpos.posAngfloate_theta[]? rms uncertainty on thetadegstat.errorfloatdpi[]? Instrumental precision of q, u, or p (1)%instr.precisionfloatdthetai[]? Instrumental precision of theta (2)degstat.error;instrfloatPassband[UBVRI] Filter system passbandmeta.notecharJ/PASP/106/949/table11Polarization of {pi} AqrrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonthMonth of observationstime.epochintYear-1900Year (offset 1900) of observationyrtime.epochintPassband[UBVRI] Filter system passbandmeta.notecharnobs[]? Number of observationsmeta.numberintq[]? Mean normalized Stokes parameter q%phys.polarization.stokesfloate_q[]? rms uncertainty on q%stat.errorfloatu[]? Mean normalized Stokes parameter u%phys.polarization.stokesfloate_u[]? rms uncertainty on u%stat.errorfloatpMean degree of polarization%phys.polarizationfloate_p[]? rms uncertainty on p%stat.errorfloatthetaMean equatorial position angledegpos.posAngfloate_theta[]? rms uncertainty on thetadegstat.errorfloatdpi[]? Instrumental precision of q, u, or p (1)%instr.precisionfloatdthetai[]? Instrumental precision of theta (2)degstat.error;instrfloatJ/PASP/106/949/table12Polarization of {omicron} AndrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonthMonth of observationstime.epochintYear-1900Year (offset 1900) of observationyrtime.epochintPassband[UBVRI] Filter system passbandmeta.notecharnobs[]? Number of observationsmeta.numberintq[]? Mean normalized Stokes parameter q%phys.polarization.stokesfloate_q[]? rms uncertainty on q%stat.errorfloatu[]? Mean normalized Stokes parameter u%phys.polarization.stokesfloate_u[]? rms uncertainty on u%stat.errorfloatpMean degree of polarization%phys.polarizationfloate_p[]? rms uncertainty on p%stat.errorfloatthetaMean equatorial position angledegpos.posAngfloate_theta[]? rms uncertainty on thetadegstat.errorfloatdpi[]? Instrumental precision of q, u, or p (1)%instr.precisionfloatdthetai[]? Instrumental precision of theta (2)degstat.error;instrfloat