J/A+A/699/A321ivo://CDS.VizieR/J/A+A/699/A321doi:10.26093/cds/vizier/bc-nv/ldcbCDSHarmanec P.Yang S.Koubsky P.Labadie-Bartz J.Dolezal P.,Ranguin S.Bozic H.Svrckova J.Zummer M.Zasche P.Ak H.2026-08-03T06:55:48Z2025-07-16T08:52:21ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsbe-starsvisible-astronomybroad-band-photometryradial-velocityIn recent years the idea, first formulated many decades ago, that the Be phenomenon could be causally related to the duplicity of Be stars, has been repeatedly reconsidered from various perspectives. It is important, therefore, to have reliable information on Be stars, which are confirmed members of binary systems. This study is devoted to V1624 Cyg = 28 Cygni, which was recently identified as a binary with a compact secondary. By measuring the radial velocities (RVs) of the wings of the H alpha emission line and using archival data and published RVs from the International Ultraviolet Explorer, we demonstrate that the Be primary moves in the 359.26d orbit found recently from interferometry. Our preliminary radial-velocity solution leads to binary masses of 5.6, and 0.66 solar masses. Moreover, we documented large and irregular spectral, brightness, and colour changes over a time interval of several decades to show that the object never completely lost its circumstellar matter.2025A&A...699A.321Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A321CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/699/A321https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/699/A321http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/699/A321https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/699/A321https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/699/A321http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/699/A321GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.322582951404819e-19 6.118840631666147e-19OpticaldefaultJ/A+A/699/A321/table3Absorption and emission-line radial velocities from the literaturerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleRVabs? Individual radial velocities of absorption lineskm/sspect.dopplerVelocfloatnullableRVem? Individual radial velocities of Balmer emissionkm/sspect.dopplerVelocfloatnullableInstNumerical code of the spectrograph usedmeta.id;instrintJ/A+A/699/A321/table4Absorption and emission-line radial velocities from our electronic spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleRVabs? Individual radial velocities of absorption lineskm/sspect.dopplerVelocfloatnullableRVem? Individual radial velocities of Balmer emissionkm/sspect.dopplerVelocfloatnullableInstNumerical code of the spectrograph usedmeta.id;instrintJ/A+A/699/A321/table6Inidividual UBV photometric observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleVmag? Johnson V magnitudemagphot.mag;em.opt.VfloatnullableBmag? Johnson B magnitudemagphot.mag;em.opt.BfloatnullableUmag? Johnson U magnitudemagphot.mag;em.opt.UfloatnullableB-V? Johnson B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableU-B? Johnson U-B colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableHDcomp? HD number of the comparison star usedmeta.id;meta.mainintnullableStationNumerical code of the observing stationmeta.id;instr.obstyint