J/A+A/670/A94ivo://CDS.VizieR/J/A+A/670/A94doi:10.26093/cds/vizier.36700094CDSRosales J.A.Mennickent R.E.Djurasevic G.Araya I.Cure M.,Schleicher D.R.G.Petrovic J.2025-01-07T20:00:53Z2023-02-10T08:51:44ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsspectroscopic-binary-starsb-starsradial-velocityvisible-astronomyA detailed study of the close interacting binary V4142 Sgr, based on photometric and spectroscopic analyses, indicates that this system belongs to the enigmatic class of Algol-like variables exhibiting a long photometric cycle of an unknown nature. By performing photometric data-mining and spectroscopic observations covering the orbital cycle, we obtained the orbital parameters and the stellar properties of the binary system, along with the physical properties of the accretion disk located around the hot star. In addition, we gained insights into the evolutive path of the system. We modeled the light curve through an inverse method, using a theoretical light curve of the binary system that considers the light curve contribution of both stars and the accretion disk of the hot star to obtain the fundamental parameters. To constrain the main stellar parameters, the mass ratio was fixed in addition to the donor temperature, using the obtained values from our spectroscopic analysis, which includes deblending methods to isolate the spectral lines of the stellar components. The system parameters were compared with a grid of binary star evolutive models in order to gain insights into the evolutionary history of the system. The orbital period and the long cycle were re-calculated, with the following result: 30.633+/-002days and 1201+/-14 days. The spectral analysis reveals H double emission with a persistent V<=R asymmetry, which is considered evidence of a possible wind emerging from the hotspot region. In addition, a cold and evolved donor star of Md=1.11+/-0.2M_{sun}_, Td=4500+/-125K and a Rd=19.4+/-0.2R_{sun}_ as well as a rejuvenated B-dwarf companion of Mg=3.86+/-0.3 M_{sun}_, Tg=14380+/-700K; and Rg=6.35+/-0.2R_{sun}_ were found. The gainer is surrounded by a concave and geometrically thick disk, creating its own atmosphere around the main component of a radial extension, Rd=22.8+/-0.3R_{sun}_ , contributing 1:4 percent of the total luminosity of the system at the V-band at orbital phase 0.25. The disk is characterized by a hot-spot roughly placed where the stream hits the disk and an additional bright-spot separated 102.5+/-0.04-degrees along the disk edge rim in the direction of the orbital motion. The system is seen under an inclination of 81.5+/-0.3{deg} and at a distance of dGaia=1140+/-35pc. Doppler maps of the emission lines reveal sites of enhanced line emission in the second and third velocity quadrants. The former would correspond to a hotspot and the latter to a bright spot detected by the light curve analysis. We find that the system comes from an initially shorter orbital period binary that inverted its mass ratio due to mass exchange. A plausible model scenario indicates that, at present, the K-type giant should have been depleted of hydrogen in its core, while the companion would have gained about 2M_{sun}_ through a process lasting about 2Myr.2023A&A...670A..94Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/670/A94CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/670/A94https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/670/A94http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/670/A94https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/670/A94https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/670/A94http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/670/A94GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/670/A94/table1Summary of photometric data for V4142 Sgr at different band passesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBandName of pass bandinstr.bandpasscharmagMagnitude in bandmagphot.magfloate_magAssociated error to magnitude in bandmagstat.error;phot.magfloatlambdaEffEffective wavelength of the Band Pass0.1nmem.wl.effectivedoubleJ/A+A/670/A94/table2Summary of spectroscopic observation using CHIRON spectrographrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate FITS file was generated in the Universal Time (UT)time.epoch;meta.fitsnullableExpTimeRequested exposure timestime.duration;obs.exposureintHJDHeliocentric Julian Daydtime.epoch;pos.heliocentricdoublephioOrbital phase of the systemtime.phasefloatphilLong cycle phase of the systemtime.phasefloatS/NSignal to noisestat.snrintJ/A+A/670/A94/table3Radial velocities of the gainer star and their respective errorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Daydtime.epoch;pos.heliocentricdoublephioOrbital phase of the systemtime.phasefloatRVRadial velocity of the systemkm/sphys.veloc;pos.heliocentricfloate_RVAssociated error to the radial velocity of the systemkm/sstat.errorfloatJ/A+A/670/A94/table4Radial velocities of the donor star and their respective errorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Daydtime.epoch;pos.heliocentricdoublephioOrbital phase of the systemtime.phasefloatRVRadial velocity of the systemkm/sphys.veloc;pos.heliocentricfloate_RVAssociated error to the radial velocity of the systemkm/sstat.errorfloatJ/A+A/670/A94/table6Fundamental parameters obtained by solving the inverse problem for the Roche model with an accretion disk around the more-massive (hotter) gainer in the critical non-synchronous rotation regimerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNNumber of observationsmeta.numberintsum(O-C)2Final sum of squares of residuals between observed (LCO) and synthetic (LCC) light-curvesstat.fit.paramfloatsigma-rmsRoot-mean-square of the residualsstat.errorfloatiOrbit inclinationdegsrc.orbital.inclinationfloate_iAssociated error for orbit inclinationdegstat.errorfloatFdDisk dimension factor (the ratio of the disk radius to the critical Roche lobe radius along y-axis)stat.fit.paramfloate_FdAssociated error for Disk dimension factorstat.errorfloatTdDisk-edge temperatureKphys.temperatureinte_TdAssociated error for Disk-edge temperatureKstat.errorintdeaDisk thicknesses at the edge of the disk in the units of the distance between the componentsmeta.notefloate_deaAssociated error for Disk thicknesses at the edge of the diskstat.errorfloatdcaDisk thicknesses at the center of the disk in the units of the distance between the componentsmeta.notefloate_dcaAssociated error for Disk thicknesses at the center of the diskstat.errorfloataTAlpha disk temperature distribution coefficientstat.fit.paramfloate_aTAssociated error for Alpha disk temperature distribution coefficientstat.errorfloatfhNon-synchronous rotation coefficient of the more massive gainer (in the critical non-synchronous rotation regime)stat.fit.paramfloate_fhAssociated error for Non-synchronous rotation coefficientstat.errorfloatFhFilling factor for the critical non-synchronous lobe of the hotter, more-massive gainerstat.fit.paramfloatThTemperature of the gainer starKphys.temperatureinte_ThAssociated error for Temperature of the gainer starKstat.errorintAhsHot spot temperature coefficientsstat.fit.paramfloate_AhsAssociated error for Hot spot temperature coefficientsstat.errorfloatthetahsSpot angular dimensiondegphys.angSizefloate_thetahsAssociated error for Spot angular dimensiondegstat.errorfloatlambdahsLongitude of hot spotdegpos.earth.lonfloate_lambdahsAssociated error for Longitude of hot spotdegstat.errorfloatthetaradAngle between the line perpendicular to the local disk edge surface and the direction of the hot-spot maximum radiationdegpos.angDistance;stat.maxfloate_thetaradAssociated error for Angle between the line perpendicular to the local disk edge surface and the direction of the hot-spot maximum radiationdegstat.errorfloatAbsbright spot temperature coefficientstat.fit.paramfloate_AbsAssociated error for bright spot temperature coefficientstat.errorfloatthetabsSpot angular dimensiondegphys.angSizefloate_thetabsAssociated error for Spot angular dimensiondegstat.errorfloatlambdabsSpot longitude dimensiondegpos.earth.lonfloate_lambdabsAssociated error for Spot longitude dimensiondegstat.errorfloatOmegahDimensionless surface potentials of the hotter gainerstat.fit.paramfloate_OmegahAssociated error for Dimensionless surface potentials of the hotter gainerstat.errorfloatOmegacDimensionless surface potentials of the cooler donorstat.fit.paramfloate_OmegacAssociated error for Dimensionless surface potentials of the cooler donorstat.errorfloatMhStellar mass of the hotter gainersolMassphys.massfloate_MhAssociated error for Stellar mass of gainer starsolMassstat.errorfloatMcStellar mass of the cooler donorsolMassphys.massfloate_McAssociated error for Stellar mass of the donor starsolMassstat.errorfloatRhStellar radius of the hotter gainersolRadphys.size.radiusfloate_RhAssociated error for Stellar radius of gainer starsolRadstat.errorfloatRcStellar radius of the cooler donorsolRadphys.size.radiusfloate_RcAssociated error for Stellar radius of the donor starsolRadstat.errorfloatlogghLogarithm (base 10) of hotter gainer effective gravitylog(cm.s**-2)phys.gravityfloate_logghAssociated error for Logarithm (base 10) of hotter gainer effective gravitylog(cm.s**-2)stat.errorfloatloggcLogarithm (base 10) of the cooler donor effective gravitylog(cm.s**-2)phys.gravityfloate_loggcAssociated error for Logarithm (base 10) of the cooler donor effective gravitylog(cm.s**-2)stat.errorfloatMhbolAbsolute stellar bolometric magnitude of hotter gainermagphys.magAbs.bolfloate_MhbolAssociated error for Absolute stellar bolometric magnitude of hotter gainermagstat.errorfloatMcbolAbsolute stellar bolometric magnitude of cooler donormagphys.magAbs.bolfloate_McbolAssociated error for Absolute stellar bolometric magnitude of cooler donormagstat.errorfloataorbOrbital semi-major axissolRadphys.angSize.smajAxisfloate_aorbAssociated error for Orbital semi-major axissolRadstat.errorfloatRdDisk radius in solar unitssolRadphys.size.radiusfloate_RdAssociated error for Disk radiussolRadstat.errorfloatdeDisk thicknesses its edge in solar unitssolRadstat.fit.paramfloate_deAssociated error for Disk thicknesses its edgesolRadstat.errorfloatdcDisk thicknesses its center in solar unitssolRadstat.fit.paramfloate_dcAssociated error for Disk thicknesses its centersolRadstat.errorfloat