J/PAZh/32/48ivo://CDS.VizieR/J/PAZh/32/48CDSArkhipova V.P.Ikonnikova N.P.Komissarova G.V.Esipov V.F.2017-07-06T06:25:56Z2006-04-13T12:50:27ZCDS support team

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

cds-question@unistra.frWe report the discovery of brightness variability in the IR-excess early F supergiant HD 331319, a candidate post-AGB star. Over three years of systematic UBV observations, the star showed low-amplitude (up to 0.17m in V) quasi-periodic brightness variations on a time scale of 45 days. A preliminary analysis of our photometry indicates that HD 331319 and other typical post-AGBF supergiants have a similar pattern of variability. A study of the extinction toward HD 331319 leads us to conclude that the fraction of the circumstellar extinction is small for this star. We present low-resolution spectroscopy for HD 331319 and discuss the spectral classification of post-AGB F supergiants using HD 331319, HD 161796, HD 187885, and HD 56126 as examples.2006PAZh...32...48Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PAZh/32/48CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PAZh/32/48https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PAZh/32/48http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PAZh/32/48https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PAZh/32/48https://vizier.iucaa.in/viz-bin/votable?-source=J/PAZh/32/48http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PAZh/32/48GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/PAZh/32/48/table1UBV observations of HD 331319B-VB-V color indexmagphot.color;em.opt.B;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian datedtime.epochintUmagU magnitudemagphot.mag;em.opt.UfloatBmagB magnitudemagphot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.VfloatU-BU-B color indexmagphot.color;em.opt.U;em.opt.Bfloat