J/A+A/666/A136ivo://CDS.VizieR/J/A+A/666/A136doi:10.26093/cds/vizier.36660136CDSHarmanec P.Bovzic H.Koubsky P.Yang S.Ruzdjak D.Sudar D.,Slechta M.Wolf M.Korcakova D.Zasche P.Oplistilova A.Vrsnjak D.,Ak H.Eenens P.Bakis H.Bakis V.Otero S.Chini R.Demsky T.,Barlow B.N.Svoboda P.Jonak J.Vitovsky K.Harmanec A.2022-10-18T14:26:05Z2022-10-17T07:57:36ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsbe-starsradial-velocityinfrared-photometryvisible-astronomybroad-band-photometryA reliable determination of the basic physical properties and variability patterns of hot emission-line stars is important for understanding the Be phenomenon and ultimately, the evolutionary stage of Be stars. This study is devoted to one of the most remarkable Be stars, V1294 Aql = HD 184279. We collected and analysed spectroscopic and photometric observations covering a time interval of about 25000d (68yr). We present evidence that the object is a single-line 192.9d spectroscopic binary and estimate that the secondary probably is a hot compact object with a mass of about 1.1-1.2M_{sun}_. We found and documented very complicated orbital and long-term spectral, light, and colour variations, which must arise from a combination of several distinct variability patterns. Attempts at modelling them are planned for a follow-up study. We place the time behaviour of V1294 Aql into context with variations known for some other systematically studied Be stars and discuss the current ideas about the nature of the Be phenomenon.2022A&A...666A.136Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/666/A136CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/666/A136https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/666/A136http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/666/A136https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/666/A136https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/666/A136http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/666/A136GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.4622242610829604e-19 6.118840631666147e-19OpticalInfrareddefaultJ/A+A/666/A136/table3V1294 Aql all measured radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDHeliocentric Julian date (HJD-2400000.0)dtime.epochdoubleRVH3em? RV of H{alpha} emission wingskm/sspect.dopplerVelocfloatnullableRVHeem? RV of HeI 6678{AA} emission wingskm/sspect.dopplerVelocfloatnullableRVSiem? RV of SiII 6347 & 6371{AA} emission wingskm/sspect.dopplerVelocfloatnullableRVH3abs? RV of the absorption core of H{alpha}km/sspect.dopplerVelocfloatnullableRVHeabs? RV of the absorption core of HeI 6678{AA}km/sspect.dopplerVelocfloatnullableRVSiabs? RV of the absorption cores of SiII lineskm/sspect.dopplerVelocfloatnullableRVHewin? RV of outer absorption wings of HeI 6678{AA}km/sspect.dopplerVelocfloatnullableRVFeabs? RV of the FeII 6456{AA} absorptionkm/sspect.dopplerVelocfloatnullableObs/InstObservatory/instrumentmeta.id;instrcharJ/A+A/666/A136/table4V1294 Aql spectrophotometry of selected spectral linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLineLine (Halpha, HeI6678, FeII6456, SiII6347, SiII6371)meta.id;spect.linecharRJDHeliocentric Julian date (HJD-2400000.0)dtime.epochdoubleEW? Equivalent width0.1nmspect.line.eqWidthfloatnullableV? Relative intensity of the V emission peak I_V_spect.line.intensity;arith.ratiodoublenullableR? Relative intensity of the R emission peak I_R_spect.line.intensity;stat.maxdoublenullableIc? Central intensity in continuum unitsspect.line.intensitydoublenullableV/R? Ratio of emission-peak intensities I_V_/I_R_pos.cartesian.ydoublenullable(V+R)/2? Mean emission peak intensity (I_V_+I_R_)/2spect.line.intensity;arith.ratiodoublenullableSourceSource of data (literature of spectrograph)meta.bibcharJ/A+A/666/A136/table5aV1294 AQL (HD 184279) UBV all-sky photometry from various sourcesVmagJohnson V magnitudemagphot.mag;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDHeliocentric Julian date (HJD-2400000.0)dtime.epochdoubleBmag? 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.BfloatnullableRefLiterature reference for the data sourcemeta.ref;pos.framecharJ/A+A/666/A136/table5bV1294 Aql (HD 184279) differential UBV photometry from various stationsBmag? Johnson B magnitudemagphot.mag;em.opt.BfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDHeliocentric Julian date (HJD-2400000.0)dtime.epochdoubleVmagJohnson V magnitudemagphot.mag;em.opt.VfloatUmag? 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.BfloatnullableHDcompHD number of the comparison star usedmeta.id;meta.mainintX? Air massobs.airMassfloatnullabledX? Difference in air mass in the sense variable-comparisonobs.airMassfloatnullableStationObservatory code (G1)meta.code;instr.obstyintJ/A+A/666/A136/table5cV1294 Aql (HD 184279) Hvar UBVR differential photometryRmagJohnson R magnitudemagphot.mag;em.opt.RfloatB-VJohnson B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatU-BJohnson U-B colour indexmagphot.color;em.opt.U;em.opt.BfloatV-RJohnson V-R colour indexmagphot.color;em.opt.V;em.opt.RfloatXAir mass of the variableobs.airMassfloatdXAir-mass difference variable minus comparisonobs.airMass;arith.difffloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDHeliocentric Julian date (HJD-2400000.0)dtime.epochdoubleVmagJohnson V magnitudemagphot.mag;em.opt.VfloatBmagJohnson B magnitudemagphot.mag;em.opt.BfloatUmagJohnson U magnitudemagphot.mag;em.opt.UfloatHDcompHD number of the comparison star usedmeta.id;meta.mainintStationObservatory code (G1)meta.code;instr.obstyintJ/A+A/666/A136/table5dV1294 Aql (HD 184279) BVR differential photometry of P. Svoboda, BrnorecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDHeliocentric Julian date (HJD-2400000.0)dtime.epochdoubleVmag? Johnson V magnitudemagphot.mag;em.opt.VfloatnullableBmag? Johnson B magnitudemagphot.mag;em.opt.BfloatnullableRmag? Cousins R magnitudemagphot.mag;em.opt.RfloatnullableHDcompHD number of the comparison starmeta.id;meta.mainintStationObservatory code (G1)meta.code;instr.obstyint