J/MNRAS/448/2890ivo://CDS.VizieR/J/MNRAS/448/2890doi:10.26093/cds/vizier.74482890CDSDimitrov D.P.Kjurkchieva D.P.2024-08-14T20:20:24Z2017-12-05T06:38:46ZCDS support team

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

cds-question@unistra.frmultiple-starseclipsing-binary-starsinfrared-photometryvisible-astronomyphotometrytwo-color-diagramsWe carried out photometric and low-resolution spectral observations of six eclipsing ultrashort-period binaries with main-sequence (MS)components. The light-curve solutions of the Rozhen observations show that all targets are overcontact systems. We found a well-defined empirical relation between period and semi-major axis for the short-period binaries and used it for estimation of the global parameters of the targets. Our results revealed that NSVS 925605 is quite an interesting target: (i) it is one of a few contact binaries with M components; (ii) it exhibits high activity (emission in the H{alpha} line, X-ray emission, large cool spots, non-Planck energy distribution); (iii) its components differ in temperature by 700 K. All the appearances of high magnetic activity and the huge fill-out factor (0.7) of NSVS 925605 may be a precursor of the predicted merging of close magnetic binaries. Another unusual binary is NSVS 2700153, which reveals considerable long-term variability.2015MNRAS.448.2890Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/448/2890CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/254 : The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996)I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)B/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)J/A+A/528/A90 : SuperWASP short period eclipsing binaries (Norton+, 2011)J/AcA/65/39 : OGLE Galactic Bulge ultra-short-period binarieshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/448/2890https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/448/2890http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/448/2890https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/448/2890https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/448/2890http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/448/2890GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/448/2890/table1 (List of our ultrashort-period targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/448/2890/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/448/2890/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/448/2890/table1?GETtext/xml+votable180.050000true88.570791744.42613890.0055555555555555566/1397 6628 6704 11830 12184 130792.762881831355591e-19 3.3785437584409506e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/448/2890?format=asciiOpticalInfrareddefaultJ/MNRAS/448/2890/table1List of our ultrashort-period targetsLCLight curvesmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTarget[1/6] Target NSVS binary (G1)meta.idintNSVSNSVS identifier (NSVS NNNNNNNN in Simbad)meta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainRmagR-band magnitudemagphot.mag;em.opt.RfloatPerPerioddtime.periodfloatRefReference (1)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/448/2890/tablea1Colours of the targets and their standard starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTarget[1/6] Target NSVS binary (G1)meta.idintStarStar identifier (Var=Variable, St=Standard)meta.idcharn_Star[*] Note on Star (1)meta.notecharIDGSC1.2 (Cat. I/254, NNNN-NNNN) and GSC2.3 (Cat. I/305, N8BMNNNNNN) identifiermeta.id;meta.maincharVmagV-band magnitudemagphot.mag;em.opt.VfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatV-RV-R colour indexmagphot.color;em.opt.V;em.opt.RfloatV-IV-I colour indexmagphot.color;em.opt.V;em.opt.IfloatJ-K2MASS J-K colour indexmagphot.color;em.IR.J;em.IR.KfloatJ/MNRAS/448/2890/tablea2Rozhen photometric datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTarget[1/6] Target NSVS binary (G1)meta.idintFilter[VRI] Filtermeta.id;instr.filtercharHJDHeliocentric Julian Datedtime.epochdoublemagMagnitude in Filtermagphot.magfloate_magUncertainty in magmagstat.error;phot.magfloatJ/MNRAS/448/2890/tablea3Times of the observed eclipse minimarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTarget[1/6] Target NSVS binary (G1)meta.idintHJDminHeliocentric Julian Date of minimumdtime.epochdoubleFilter[VRI] Filtermeta.id;instr.filtercharMin[I II] Type of minimum (I=primary, II=secondary)meta.codecharEpoch[-1/2189] Epochtime.epochintO-CObserved minus calculated time of minimumdtime;arith.diffdouble