J/A+A/694/A172ivo://CDS.VizieR/J/A+A/694/A172doi:10.26093/cds/vizier.36940172CDSRivinius T.Klement R.Chojnowski S.D.Baade D.Abdul-Masih M.,Przybilla N.Guarro Flo J.Heathcote B.Hadrava P.Gies D.Shepard K.,Buil C.Garde O.Thizy O.Monnier J.D.Anugu N.Lanthermann C.,Schaefer G.Davies C.Kraus S.Ennis J.Setterholm B.R.Gardner T.,Ibrahim N.Chhabra S.Gutierrez M.Codron I.Mortimer D.2025-05-21T20:01:33Z2025-02-11T09:40:06ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsorbitsradial-velocityinterferometrybe-starsMany classical Be stars acquire their very rapid rotation by mass and angular-momentum transfer in massive binaries. Short-lived intermediate-phase objects have only been discovered recently. Data archives and the literature have been searched for additional candidates exhibiting this patterns. Thirteen candidates were identified at various confidence levels. Adding to the two known systems identified as classical Be star+pre-subdwarf binaries (LB-1 and HR 6819), two more (V742 Cas, HD 44637) could be confirmed with interferometry, with V742 Cas setting a new record for the smallest visually observed angular semi-major axis, at a=0.663mas. Two further ones (V447 Sct, V1362 Cyg) are not resolved interferometrically, but other evidence puts them at the same confidence level as LB-1. V2174 Cyg is a candidate with very high confidence, but was not observed interferometrically. The remaining ones are either candidates with varying levels of confidence. Of a mostly magnitude complete sample of 328 Be stars, 0.5-1% are found to have recently completed the mass overflow that led to their formation. Another 5% are systems with compact subdwarf companions, i.e., further evolved after a previous overflow, and possibly two more percent harbor white dwarfs. All these systems are of early B-subtypes, however, and if the original sample is restricted to early subtypes (136 objects), these percentages increase by a factor of about 2.5, while dropping to zero for the mid and late subtypes (together 204 objects). This strongly suggests that early- vs. mid- and late-type Be stars have differently weighted channels to acquire their rapid rotation, namely binary interaction vs. evolutionary spin-up.2025A&A...694A.172Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/694/A172CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/694/A172https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/694/A172http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/694/A172https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/694/A172https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/694/A172http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/694/A172GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/694/A172/tablea1Radial velocities for V447 SctrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian datedtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatSourceOrigin of spectrummeta.refcharJ/A+A/694/A172/tablea2Radial velocities for V1362 CygrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian datedtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatSourceOrigin of spectrummeta.refcharJ/A+A/694/A172/tablea3Radial velocities for V742 CasrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian datedtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatSourceOrigin of spectrummeta.refcharJ/A+A/694/A172/tablea4Radial velocities for HD 44637recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian datedtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatSourceOrigin of spectrummeta.refcharJ/A+A/694/A172/tableb1log of interferometric observationsInstInterferometer usedmeta.id;instrcharTargetObject Namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand/ResObserving band/Resolutioninstr.bandpasscharMJDModified Julian datedtime.epochdoubleDateCivil datetime.epochnullableCalibratorObject Namemeta.idcharJ/A+A/694/A172/tableb2List of calibratorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCalibratorObject Namemeta.idcharUDdiamHUniform disk diameter, H bandmasphys.angSizefloate_UDdiamHUniform disk diameter error, H bandmasstat.errorfloatUDdiamKUniform disk diameter, K bandmasphys.angSizefloate_UDdiamKUniform disk diameter error, K bandmasstat.errorfloatJ/A+A/694/A172/tableb3Relative astrometry and fluxes for V742CasrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian datedtime.epochdoubleSepSeparationmaspos.angDistancefloatPAPosition angledegpos.posAngfloatoRAOffset in RAmaspos.eq.ra;arith.difffloatoDEOffset in DECmaspos.eq.dec;arith.difffloate-amajError ellipse major axis lengthmasphys.angSize.smajAxisfloate-bminError ellipse minor axis lengthmasphys.angSize;pos.errorEllipsefloate-PAError ellipse position angledegpos.posAng;pos.errorEllipsefloatfpriPrimary flux percentage%phot.flux;arith.ratiofloate_fpriPrimary flux percentage, positive error%stat.errorfloatE_fpriPrimary flux percentage, negative error%stat.error;stat.maxfloatBandObserving bandinstr.bandpasschar