J/MNRAS/459/4360ivo://CDS.VizieR/J/MNRAS/459/4360doi:10.26093/cds/vizier.74594360CDSLiska J.Skarka M.Zejda M.Mikulasek Z.de Villiers S.N.2024-08-16T20:17:01Z2016-06-02T08:28:21ZCDS support team

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

cds-question@unistra.frvariable-starshorizontal-branch-starsorbitsphotometryccd-photometryThis paper presents an extensive overview of known and proposed RR Lyrae stars in binaries. The aim is to revise and extend the list with new Galactic field systems. We utilized maxima timings for 11 RRab type stars with suspicious behaviour from the GEOS database, and determined maxima timings from data of sky surveys and our own observations. This significantly extended the number of suitable maxima timings. We modelled the proposed Light Time Effect (LiTE) in O-C diagrams to determine orbital parameters for these systems. In contrast to recent studies, our analysis focused on decades-long periods instead of periods in the order of years. Secondary components were found to be predominantly low-mass objects. However, for two of the stars, RZ Cet and AT Ser, the mass of the suspected companion of more than one solar mass suggests that it is a massive white dwarf, a neutron star or even a black hole. We found that the semi-major axes of the proposed orbits are between 1 and 20au. Because the studied stars belong to the closest RR Lyraes, maximal angular distances between components during orbit should at least be between 1 and 13mas and this improves the chance to detect both stars using current telescopes and interferometers. However, our interpretation of the O-C diagrams as a consequence of the LiTE should be considered as preliminary without reliable spectroscopic measurements. On the other hand, our models give a prediction of the period and radial velocity evolution which should be sufficient for plausible proof of binarity.2016MNRAS.459.4360Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/459/4360CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/459/4360https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/459/4360http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/459/4360https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/459/4360https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/459/4360http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/459/4360GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/459/4360/table3 (RRLyrBinCan database - candidates (64 stars))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/459/4360/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/459/4360/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/459/4360/table3?GETtext/xml+votable180.050000true2.92125-1.74869440.005555555555555556Cone search capability for table J/MNRAS/459/4360/table4 (RRLyrBinCan database - false positives)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/459/4360/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/459/4360/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/459/4360/table4?GETtext/xml+votable180.050000true76.8792083-69.50286110.0055555555555555565/7205 6/110 572 2484 4479 4942 7518 9138 9938 10334 11098 11576 11691 12743 13171 14857 14935 14939 14955 15106 15120 16018 16022 18080 19169 19449 20097 21939 26435 26981 27824 28143 28227 28582 28710 28713 28721 28730 28776 28779 28864-28866 28869 28871 28882 31648 31743 32239 32254 33055 33077 33097-33098 33120 36781 40722 41191 41823https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/459/4360?format=asciiOpticaldefaultJ/MNRAS/459/4360/table1BVRI-photometry of VX HerrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoublemagMagnitude in Bandmagphot.magfloate_magUncertainty of magnitudemagstat.error;phot.magfloatBand[BVRI] Photometric band, Johnson-Cousins bandinstr.bandpasscharJ/MNRAS/459/4360/table2Green-photometry of AT Ser and SS LeorecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the RR Lyrae starmeta.id;meta.maincharHJDHeliocentric Julian Datedtime.epochdoublemagMagnitude in Bandmagphot.magfloate_magUncertainty of magnitudemagstat.error;phot.magfloatBand[green] Photometric band, green bandinstr.bandpasscharJ/MNRAS/459/4360/table3RRLyrBinCan database - candidates (64 stars)n_Porbu[-,]meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the RR Lyrae starmeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainmagUpper value of brightness range, mean brightness in given bandmagphot.magfloatmagL? Lower value of brightness range, mean brightness in given bandmagphot.mag.sbfloatnullableBand[V pg Kp] Band for brightness rangeinstr.bandpasscharBlaz[B B? -] Blazhko (1)meta.codecharType[RRab RRc] RR Lyrae typemeta.notecharl_PorbLimit flag on Porbmeta.code.errorcharPorb? Expected orbital perioddtime.perioddoublenullablePorbu? upper value of Porb interval or second valuetime.perioddoublenullablex_Porb[d yr] Expected orbital period unitmeta.unitcharMethMethod of detection (2)meta.code;obscharRefReference, in refs.dat filemeta.ref;pos.frame;meta.filecharRemRemarksmeta.notecharJ/MNRAS/459/4360/table4RRLyrBinCan database - false positivese_mag? rms uncertainty on magmagstat.error;phot.magfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the RR Lyrae starmeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainmagUpper value of brightness range, mean brightness in given bandmagphot.magfloatmagL? Lower value of brightness range, mean brightness in given bandmagphot.mag.sbfloatnullableBand[V] Band for brightness rangeinstr.bandpasscharBlaz[B B? -] Blazhko (1)meta.codecharPpuls? Pulsation perioddtime.perioddoublenullablePorb? Expected orbital/secondary pulsation periodmeta.notedoublenullableu_Porb[?] Uncertainty flag on Porbmeta.code.errorcharx_Porb[d yr] Expected orbital/secondary pulsation period unitmeta.unitcharTypeBinary type (2)src.classcharRefReference, in refs.dat filemeta.ref;pos.frame;meta.filecharRemRemarksmeta.notecharJ/MNRAS/459/4360/table5*Maxima timings from GEOS RR Lyr database for the 11 starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarGCVS namemeta.id;meta.maincharHJDHeliocentric Julian Date, time of maximumdtime.epochdoublee_HJD? Uncertainty of time of maximum (1)dstat.error;time.epochfloatnullableRefReference, in refs.dat filemeta.ref;pos.frame;meta.filecharObsObserverobs.observercharObsMetObservation methodmeta.code;obscharJ/MNRAS/459/4360/table6*Maxima timings determined in this study, for the 11 starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarGCVS namemeta.id;meta.maincharHJDHeliocentric Julian Date, time of maximumdtime.epochdoublee_HJDUncertainty of time of maximumdstat.error;time.epochfloatObsMetObservation methodmeta.code;obscharObsObserving project/observer and instrumentobs.observercharJ/MNRAS/459/4360/refsReferencesComCommentsmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharBibCodeBibCodemeta.bib.bibcodechar