J/A+A/696/A82ivo://CDS.VizieR/J/A+A/696/A82doi:10.26093/cds/vizier/bc-nr/licCDSNavarrete C.Recio-Blanco A.de Laverny P.Escorza A.2026-07-03T06:36:56Z2025-04-08T07:25:35ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starslate-type-starsvisible-astronomystellar-masseseffective-temperatureThe latest Gaia Focused Product Release (FPR) provided variability information for ~1000 long-period red giant binaries, including almost ~700 ellipsoidal binary candidates, the largest sample to date of this binary type having both photometric and spectroscopic time series observations. We aim to characterise physically (luminosity, mass, radius) and chemo-dynamically (metallicity, [alpha/Fe], Galactic velocities) the population of long-period red giant ellipsoidal binary candidates, and a subsample of rotational variable candidates, from Gaia FPR, combining Gaia astrometry, photometry and spectroscopy observations. We cross-matched the Gaia DR3 measurements (positions, velocities, atmospheric parameters, chemical abundances) with the catalogue of long-period red giant candidates from the Gaia FPR, having photometric and radial velocity variability information. Combined with the photo-geometric distances, the extinction, bolometric magnitude, luminosity, spectroscopic radius and mass were estimated. The accuracy of this method was tested for similar samples in the literature, including red giant binaries having asteroseismic determination of their physical parameters. Ellipsoidal variables are characterized to be low to intermediate-mass stars (0.6<=M1<=5.0M_{sun}_), with radii as large as the Roche lobe radius of the binary. Eccentricities tend to be lower for primary stars with smaller radii, as the expected result of tidal circularization. Combined with the orbital properties, estimates for the minimum mass of the companion agree with the scenario of a low-mass compact object as the secondary star. There are at least 14 ellipsoidal binaries with orbital periods and masses of the two stars compatible with model predictions for Type Ia SN progenitors. For the rotational variables, their orbital periods, enhanced chromospheric activity, smaller radii and low mass (M_1_<=1.5M_{sun}_) point to a different type of binaries than the original ellipsoidal sample. The Galactic velocities indicate that ellipsoidal variables are found both in the Galactic disk and halo, while rotational variables are predominantly concentrated in the Galactic disk. The velocity dispersion is much higher in ellipsoidal than in rotational binaries, probably indicating older/younger dynamical ages. The enhanced [alpha/Fe] abundances for some of the ellipsoidal binaries, having M_1>=1.0M_{sun}_, resemble the population of young alpha-rich binaries in the thick disk. An episode of mass transfer in those systems may have produced the enhanced alpha abundances, and the enhanced [Ce/Fe] abundances reported in a few ellipsoidal binaries. Luminosities, radii and masses were derived for 243 ellipsoidal and 39 rotational binary candidates, the largest Galactic sample of these variables, having chemo-dynamical and physical parametrization. Based on their mean chemo-dynamical properties and stellar parameters, these binaries can be considered as two manifestations of the same phenomena, a close binary with a giant primary, instead of two independent, unrelated binary types. Detailed future analysis of individual sources will provide insights into the history and future evolution of these binaries.2025A&A...696A..82Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/696/A82CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/696/A82https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/696/A82http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/696/A82https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/696/A82https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/696/A82http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/696/A82GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/696/A82/tablee12 (Stellar parameters for the primary star (table E1) and mass estimate, mass ratio, filling factor (table E2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/696/A82/tablee12?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/696/A82/tablee12?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/696/A82/tablee12?GETtext/xml+votable180.050000true2.569153161.59266780.0055555555555555566/1269 1321 1434 1446 1932 2487 2917 2967 3052 3141 3190 3366 3392 3485 3614 3733 3743 3815 3854 3924 4472 4763 5635 6509 7835 7870 8567 12474 12479 12803 12942 12964 12976 13017 13027 13034 13039 13136 13197 13211-13212 13230 13239 13423 13800 13814 13940 13953 13995 14007 14072 14120 14122 14133 14151 14159 14229 14237 14241 14328 14342 14367 14376-14377 14387 14415 14433 14441 14478 14517 14519 14559 14577 14623 14643 14722 14726 14744 14809 14858 14993 15223 15265 15367 15381 15385 15510 15649 15851 15854 15925 16008 16151 19896 20682 20764 21724 22185 22903 22909 22975 24071 24133 29196 29203 29216 29225 29228 29293 29325 29365 29368 29407 29609 29611 29643 30190 30538 30571 31062 31121 31171 31748 31957 32035 32098 32116 32125 32143 32160 32196 32230 32254 32263 32293 32639 33539 33585 34048 37023 37183 37224 37268 37317 37340 37361 37617 37704 37741 37756 37764 37775 37811 37843 37868 37873 37895 37919 37926 37942 37954 37986 37998-37999 38021 38032 38057 38131-38132 38219 38222 38403 38414 38417 38462 38476 38485 38528 38590 38632-38633 38961 38992 39109 39168 39172 39200 39211 39263 39287 39295-39296 39301 39393 39535 39671 39702 39761 39787 39806 39847 39875 39877 39981 39986 40103 40513 40582 40597 40601 40686 41070 41137 41226 41275 41287 41316 41333 41380 41387 41458 41465 41481 41497 41516-41517 41526 41549 41559 41563 41578 41590 41635-41636 41652 41677 41696 41706 41715 41721 41849 41862 41880 41916 42000 42038 42148 42150 42229 42322 42381 42387 42505 42577 42660 42824 42916 43060 43065 43078 43104 43109 43141 43623 43652 44816 45232 45237 45326 46102 47250 47273 47278 47301 47547 48187 48532 48618 48865 49144https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/696/A82?format=asciiOpticaldefaultJ/A+A/696/A82/tablee12Stellar parameters for the primary star (table E1) and mass estimate, mass ratio, filling factor (table E2)SimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Star Name (Gaia DR3 source_id)meta.id;meta.mainPorbOrbital perioddtime.perioddoubleTeffEffective temperatureKphys.temperature.effectivefloate_TeffEffective temperature uncertaintyKstat.error;phys.temperature.effectivefloatloggStellar surface gravity in log scalelog(cm.s**-2)instr.scalefloate_loggStellar surface gravity uncertaintylog(cm.s**-2)stat.errorfloatAGG-band absorptionmagphys.absorptiondoublee_AGG-band absorption uncertaintymagstat.errordoubleL1Stellar luminosity of the primary starsolLumphys.luminositydoublee_L1Stellar luminosity uncertaintysolLumstat.errordoubleR1Stellar radius of the primary starsolRadphys.size.radiusdoublee_R1Stellar radius uncertaintysolRadstat.errordoubleM1Stellar mass of the primarysolMassphys.massdoublee_M1Stellar mass uncertaintysolMassstat.errordoubleSourceSource of the atmospheric parametersmeta.bibintFlag[GRU] Flag for the quality of the light curve (1)meta.code.errorcharVType[ELL ROT] Variability type (G1)meta.notecharM2minMinimum mass of the secondarysolMassphys.mass;stat.mindoublee_M2minMinimum mass of the secondary uncertaintysolMassstat.errordoubleqminMinimum mass ratiophys.mass;stat.mindoubleM2max? Maximum mass of the secondarysolMassphys.mass;stat.maxdoublenullablee_M2max? Maximum mass of the secondary uncertaintysolMassstat.errordoublenullablee_qminMinimum mass ratio uncertaintystat.errordoubleFilfacFilling factorstat.fit.paramdoublee_FilfacFilling factor uncertaintystat.errordouble_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main