J/ApJ/936/129ivo://CDS.VizieR/J/ApJ/936/129doi:10.26093/cds/vizier.19360129CDSNodyarov A.S.Miroshnichenko A.S.Khokhlov S.A.Zharikov S.V.,Manset N.Klochkova V.G.Grankin K.N.Arkharov A.A.Efimova N.,Klimanov S.Larionov V.M.Rudy R.J.Puetter R.C.Perry R.B.,Reva I.V.Omarov C.T.Kokumbaeva R.I.2024-11-06T20:27:09Z2024-08-06T08:21:29ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsbe-starsinfrared-photometryvisible-astronomyWe present the results of optical and near-IR spectroscopy and multicolor photometry of the emission-line star MWC 645, which exhibits the B[e] phenomenon. The presence of positionally variable absorption lines of a cool star detected for the first time indicates that the object is a binary system. Using a combination of the photometric and spectroscopic data as well as the Gaia EDR3 distance (D=6.5{+/-}0.9kpc), we disentangled the components' contributions and estimated their surface temperatures and luminosities (18000{+/-}2000K and 4250{+/-}250K, log(L/L{sun})=4.0{+/-}0.5 and 3.1{+/-}0.3 for the hot and cool components, respectively). Quasi-cyclic short-period (months) and long-period (~4yr) photometric variations were detected in both optical and near-IR regions, and are most likely due to variable circumstellar extinction. Our analysis suggests that MWC 645 is a member of the FS CMa group. The object's properties can be described by an evolutionary model of a close binary system that currently undergoes a nonconservative mass transfer between intermediate-mass stars (e.g., 7M{sun}+2.8M{sun}).2022ApJ...936..129Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/936/129CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)VI/71 : Revised version of the ILLSS Catalogue (Coluzzi 1993-1999)J/A+AS/120/99 : Spectroscpy of MWC 645 (Jaschek+, 1996)J/A+A/463/233 : UBV and radial velocity light curves of beta Lyr (Ak+, 2007)J/A+A/487/1129 : Evolutionary models of binaries (Van Rensbergen+, 2008)J/A+A/537/A146 : Star models with rotation. 0.8<M<120, Z=0.014 (Ekstrom+, 2012)J/ApJ/746/154 : Improved kinematic plxes for Sco-Cen members (Pecaut+, 2012)J/ApJ/774/72 : Measure of 19 DIBs and 8 other interstellar lines (Kos+, 2013)J/ApJ/809/129 : The Be phenomenon. V. MWC728 (Miroshnichenko+, 2015)J/ApJ/856/158 : The B[e] phenomenon. VII. AS 386 follow-up (Khokhlov+, 2018)J/ApJ/897/48 : Props of Galactic Be Supergiants. VI. (Miroshnichenko+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/936/129https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/936/129http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/936/129https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/936/129https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/936/129http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/936/129GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/936/129/table2*Optical photometry of MWC 645recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[53228/59736] Heliocentric Julian Date; HJD-2400000dtime.epochdoubleFlag[ab] Location flag (1)meta.code.errorcharVmag[12.8/13.3] Apparent V band magnitudemagphot.mag;em.opt.VfloatUB[-0.37/0.13]? The (U-B) color-indexmagphot.color;em.opt.U;em.opt.BfloatnullableBV[0.7/1.06] The (B-V) color-indexmagphot.color;em.opt.B;em.opt.RfloatVR[2.01/2.28]? The (V-R) color-indexmagphot.color;em.opt.V;em.opt.RfloatnullableJ/ApJ/936/129/table3Near-IR photometry of MWC 645recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[54757/57897] Average Heliocentric Julian Date; HJD-2400000dtime.epochdoubleFlag[a] Location flag (1)meta.code.errorcharJmag[9.19/10.15]? Apparent J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.01/0.04]? Uncertainty in Jmagmagstat.error;phot.magfloatnullableHmag[7.88/8.74]? Apparent H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.01/0.05]? Uncertainty in Hmagmagstat.error;phot.magfloatnullableKmag[6.42/7.11] Apparent K band magnitudemagphot.mag;em.IR.Kfloate_Kmag[0.01/0.06] Uncertainty in Kmagmagstat.error;phot.magfloatJ/ApJ/936/129/table4List of emission lines identified in the 2008 CFHT spectrum of MWC 645recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLineElement and ionization statemeta.id;spect.linecharMultMultiplet number (1)meta.id;meta.maincharWave[3966/10407] Line laboratory wavelength; Angstroms0.1nmem.wl;spect.linedoubleRVel[-124.5/-15.7] Radial velocitykm/sspect.dopplerVelocfloatFlag[:] Indicates identification is uncertainmeta.code.errorcharJ/ApJ/936/129/table6List of absorption lines identified in the spectrum of MWC 645recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLineElement and ionization statemeta.id;spect.linecharMult[1/1277] Multiplet number (1)meta.id;meta.mainintWave[4611/9000] Line laboratory wavelength; Angstroms0.1nmem.wl;spect.linefloatRVel1[-38.3/-12.4] The 2008 CFHT spectrum radial velocitykm/sspect.dopplerVelocfloatEW1[0.02/0.33]? The 2008 CFHT spectrum equivalent width; Angstoms0.1nmspect.line.eqWidthfloatnullableRVel2[-66.8/-38.5]? The 2021 CFHT spectrum radial velocitykm/sspect.dopplerVelocfloatnullableEW2[0.02/0.14]? The 2021 CFHT spectrum equivalent width; Angstoms0.1nmspect.line.eqWidthfloatnullable