J/PAZh/42/831ivo://CDS.VizieR/J/PAZh/42/831CDSArkhipova V.P.Taranova O.G.Ikonnikova N.P.Esipov V.F.,Komissarova G.V.Shenavrin V.I.Burlak M.A.2017-06-28T06:58:47Z2016-12-06T13:04:38ZCDS support team

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

cds-question@unistra.frvariable-starssupergiant-starsvisible-astronomyWide-band photometryinfrared-photometryWe present the results of our UBV and JHKLM photometry for the semiregular pulsating variable V1027 Cyg, a supergiant with an infrared excess, over the period from 1997 to 2015 (UBV) and in 2009-2015 (JHKLM). Together with the new data, we analyze the photometric observations of V1027 Cyg that we have obtained and published previously. Our search for a periodicity in the UBV brightness variations has led to several periods from P=212d to 320d in different time intervals. We have found the period P=237d based on our infrared photometry. The variability amplitude, the lightcurve shape, and the magnitude of V1027 Cyg at maximum light change noticeably from cycle to cycle.2016PAZh...42..831Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PAZh/42/831CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/PAZh/26/465 : IRAS 20004+2955 (V1027 Cyg) chemical comp. (Klochkova+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PAZh/42/831https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PAZh/42/831http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PAZh/42/831https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PAZh/42/831https://vizier.iucaa.in/viz-bin/votable?-source=J/PAZh/42/831http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PAZh/42/831GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.533079825982027e-20 6.118840631666147e-19OpticalInfrareddefaultJ/PAZh/42/831/table1UBV photometry for V1027 CygVmagJohnson V magnitudemagphot.mag;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian datedtime.epochintBmagJohnson B magnitudemagphot.mag;em.opt.BfloatUmagJohnson U magnitudemagphot.mag;em.opt.UfloatB-VJohnson B-V color indexmagphot.color;em.opt.B;em.opt.VfloatU-BJohnson U-B color indexmagphot.color;em.opt.U;em.opt.BfloatJ/PAZh/42/831/table3JHKLM photometry for V1027 Cyg over the period 2009-2015recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian datedtime.epochdoubleJmagJohnson J magnitudemagphot.mag;em.IR.JfloatHmagJohnson H magnitudemagphot.mag;em.IR.HfloatKmagJohnson K magnitudemagphot.mag;em.IR.KfloatLmagJohnson L magnitudemagphot.mag;em.IR.3-4umfloatMmag? Johnson M magnitudemagphot.mag;em.IR.4-8umfloatnullable