J/AJ/116/469ivo://CDS.VizieR/J/AJ/116/469doi:10.26093/cds/vizier.51160469CDSMetzger M.R.Schechter P.L.2023-04-06T16:50:31Z2000-04-22T22:39:24ZCDS support team

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

cds-question@unistra.frvariable-starsccd-photometryWe present results of a survey of a 6deg^2^ region near l=60{deg}, b=0{deg} to search for distant Milky Way Cepheids. Few such Cepheids are known at distances >~ R_0_, limiting large-scale Milky Way disk models derived from Cepheid kinematics; this work was designed to find a sample of distant Cepheids for use in such models. The survey was conducted in the V and I bands over eight epochs, to a limiting I~=18, with a total of almost 5 million photometric observations of over 1 million stars. We present a catalog of 578 high-amplitude variables discovered in this field. Cepheid candidates were selected from this catalog on the basis of variability and color change and observed again the following season. We confirm 10 of these candidates as Cepheids with periods from 4 to 8 days, most at distances greater than 3kpc. Many of the Cepheids are heavily reddened by intervening dust, some with implied extinction A_V_>10mag. With a future addition of infrared photometry and radial velocities, these stars alone can provide a constraint on R_0_ to 8% and in conjunction with other known Cepheids should provide good estimates of the global disk potential ellipticity.1998AJ....116..469Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/116/469CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/116/469https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/116/469http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/116/469https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/116/469https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/116/469http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/116/469GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/116/469/table1 (Galactic plane regions, 50{deg}<l<70{deg})https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/116/469/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/116/469/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/116/469/table1?GETtext/xml+votable180.050000true296.17333323.8905560.005555555555555556Cone search capability for table J/AJ/116/469/table3 (*High-amplitude variable stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/116/469/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/116/469/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/116/469/table3?GETtext/xml+votable180.050000true296.223.9050.005555555555555556Cone search capability for table J/AJ/116/469/table4 (New Cepheids)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/116/469/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/116/469/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/116/469/table4?GETtext/xml+votable180.050000true292.81458319.0116670.0055555555555555565/3588-3589 3607 7679 6/12970-12971 12974 14340-14341 14402-14403 14406-14409 14412-14413 14424-14425 14427 14600 14602 30695 30701 30706 30712-30713https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/116/469?format=asciiOpticaldefaultJ/AJ/116/469/table1Galactic plane regions, 50{deg}<l<70{deg}recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegionRegion identification numbermeta.id;meta.mainintGLONGalactic longitude of field centerdegpos.galactic.lonGLATGalactic latitude of field centerdegpos.galactic.latfloatRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainJ/AJ/116/469/table3*High-amplitude variable starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[MS98]Catalog identification numbermeta.id;meta.maincharprimaryRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.main<I>magAverage I magnitudemagphot.mag;em.opt.Ifloate_<I>magrms uncertainty on <I>magmagstat.errorfloat2_<I>mag{xi}^2^ value on <I>magstat.errorfloat<V>-<I>? <V>-<I> colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableNotesNotes (1)meta.notecharJ/AJ/116/469/table4New CepheidsPerPerioddtime.periodfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar name from J2000 positionmeta.id;meta.mainchar[MS98]Catalog identification numbermeta.idcharprimaryRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.main<I>magAverage I magnitudemagphot.mag;em.opt.Ifloatl_<V>-<I>Limit flag on <V>-<I>meta.code.errorchar<V>-<I><V>-<I> colour indexmagphot.color;em.opt.V;em.opt.Ifloat