J/A+A/647/A97ivo://CDS.VizieR/J/A+A/647/A97doi:10.26093/cds/vizier.36470097CDSWolf M.Harmanec P.Bozic H.Koubsky P.Yang S.Ruzdjak D.Slechta M.,Ak H.Bakis H.Bakis V.Oplistilova A.K.Vitovsky.2021-09-10T15:00:52Z2021-03-15T07:06:17ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsline-intensitiesradial-velocityWe present the latest results of a long-term observational project aimed at observing, collecting from the literature, and homogenising the light, colour, and spectral variations of the well-known emission-line Be star V923 Aql. Our analysis of these parameters confirms that all of the observables exhibit cyclic changes with variable cycle length between about 1800 and 3000 days, so far documented for seven consecutive cycles. We show that these variations can be qualitatively understood within the framework of the model of one-armed oscillation of the circumstellar disk, with a wave of increased density and prograde revolution in space. We confirm the binary nature of the object with a 214.716 day period and estimate the probable system properties. We also confirm the presence of rapid light, and likely also spectral changes. However, we cannot provide any firm conclusions regarding their nature. A quantitative modelling study of long-term changes is planned as a follow-up to this work.2021A&A...647A..97Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/647/A97CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/550/A79 : H{alpha} & H{beta} lines of northern Be stars (Catanzaro, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/647/A97https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/647/A97http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/647/A97https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/647/A97https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/647/A97http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/647/A97GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/647/A97/table1All RVs from the literature, edited and corrected for misprintsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDReduced Julian date (JD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatSpgNoSpectrograph number (1)meta.idintJ/A+A/647/A97/table3Spectrophotometry of H{alpha} line from various published papersRefReferencesmeta.refcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDReduced Julian date (JD-2400000)dtime.epochdoubleVPeak intensity of the double emission I_V_spect.line.intensity;arith.ratiofloatRPeak intensity of the double emission I_R_spect.line.intensity;arith.ratiofloat(V+R)/2Peak intensity of the double emission (I_V_+I_R_)/2spect.line.intensity;arith.ratiofloatV/RPeak intensity ratio I_V_/I_R_spect.line.intensity;arith.ratiofloatIc? Central intensity of the shell absorption line I_c_spect.line.intensityfloatnullableEWHa? H{alpha} equivalent width0.1nmspect.line.eqWidthfloatnullablee_EWHa? rms error on EWHa0.1nmstat.errorfloatnullableJ/A+A/647/A97/table4aH{alpha} emission wingsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDReduced Julian date (JD-2400000)dtime.epochdoubleEWH{alpha} equivalent width0.1nmspect.line.eqWidthfloatVPeak intensity of the double emission I_V_spect.line.intensity;arith.ratiofloatRPeak intensity of the double emission I_R_spect.line.intensity;arith.ratiofloatIcCentral intensity of the shell absorption line I_c_spect.line.intensityfloatV/RPeak intensity ratio I_V_/I_R_phot.flux;arith.ratiofloat(V+R)/2Peak intensity of the double emission (I_V_+I_R_)/2spect.line.intensity;arith.ratiofloatObsData sources (G1)meta.codecharJ/A+A/647/A97/table4bSiII 6371 spectrophotometric quantities measured on electronic spectra at our disposalrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDReduced Julian date (JD-2400000)dtime.epochdoubleEWSiII equivalent width0.1nmspect.line.eqWidthfloatFWHM? SiII FWHM0.1nmspect.line.widthfloatnullableIc? Central intensity of the shell absorption line I_c_spect.line.intensityfloatnullableObsData sources (G1)meta.codecharJ/A+A/647/A97/table4cSiII 6347 spectrophotometric quantities measured on electronic spectra at our disposalrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDReduced Julian date (JD-2400000)dtime.epochdoubleEWSiII equivalent width0.1nmspect.line.eqWidthfloatFWHM? SiII FWHM0.1nmspect.line.widthfloatnullableIc? Central intensity of the shell absorption line I_c_spect.line.intensityfloatnullableObsData sources (G1)meta.codecharJ/A+A/647/A97/table4dHeI 6678 wingsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDReduced Julian date (JD-2400000)dtime.epochdoubleIc? Central intensity of the shell absorption line I_c_spect.line.intensityfloatnullableObsData sources (G1)meta.codecharJ/A+A/647/A97/table4eFeII 6677 sharp coreObsData sources (G1)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDReduced Julian date (JD-2400000)dtime.epochdoubleIc? Central intensity of the shell absorption line I_c_spect.line.intensityfloatnullableJ/A+A/647/A97/table2All RVs with their rms errors measured on electronic spectra at our disposalrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJDReduced Julian date (JD-2400000)dtime.epochdoubleHaweRVH{alpha} wings of emission radial velocitykm/sspect.dopplerVelocfloate_HaweRVH{alpha} wings of emission radial velocity rms errorkm/sstat.errorfloatHaacRVH{alpha} absorption core radial velocitykm/sspect.dopplerVelocfloate_HaacRVH{alpha} absorption core radial velocity rms errorkm/sstat.errorfloatHeIIawRV? HeII 6678 absorption wings radial velocitykm/sspect.dopplerVelocfloatnullablee_HeIIawRV? HeII 6678 absorption wings radial velocity rms errorkm/sstat.errorfloatnullableFeIIacRV? FeII 6677 absorption core radial velocitykm/sspect.dopplerVelocfloatnullablee_FeIIacRV? FeII 6677 absorption core radial velocity rms errorkm/sstat.errorfloatnullableSiIIacRV? SiII 6347&6371 absorption cores radial velocitykm/sspect.dopplerVelocfloatnullablee_SiIIacRV? SiII 6347&6371 absorption cores radial velocity rms errorkm/sstat.errorfloatnullableObsData sources (G1)meta.codechar