J/ApJS/186/233ivo://CDS.VizieR/J/ApJS/186/233doi:10.26093/cds/vizier.21860233CDSBhatti W.A.Richmond M.W.Ford H.C.Petro L.D.2017-07-10T12:05:10Z2010-05-31T20:32:01ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsvariable-starssurveysinfrared-photometryvisible-astronomyWide-band photometrysloan-photometryWe report the first results of a study of variable point sources identified using multi-color timeseries photometry from Sloan Digital Sky Survey (SDSS) Stripe 82, including data from the SDSS-II Supernova Survey, over a span of nearly 10 years (1998-2007). We construct a light-curve catalog of 221842 point sources in the R.A. 0-4hr half of Stripe 82, limited to r=22.0mag, that have at least 10 detections in the ugriz bands and color errors <0.2mag. These sources are then classified by color and by cross matching them to existing SDSS catalogs of interesting objects. Inhomogeneous ensemble differential photometry techniques are used to greatly improve our sensitivity to variability and reduce contamination by sources that appear variable due to large photometric noise or systematic effects caused by non-uniform photometric conditions throughout the survey. We use robust variable identification methods to extract 6520 variable candidates from this data set, resulting in an overall variable fraction of ~2.9% at the level of ~0.05mag variability. Despite the sparse and uneven time sampling of the light-curve data, we discover 143 periodic variables in total. Due to period ambiguity caused by relatively poor phase coverage, we identify a smaller final set of 101 periodic variables with well-determined periods and light curves. Among these are 55 RR Lyrae, 30 eclipsing binary candidates, and 16 high-amplitude Delta Scuti variables. In addition to these objects, we also identify a sample of 2704 variable quasars matched to the SDSS Quasar Catalog, which make up a large fraction of our variable candidates. An additional 2403 quasar candidates are tentatively identified and selected by their non-stellar colors and variability. A sample of 11328 point sources that appear to be nonvariable given the limits of our variability sensitivity is also briefly discussed. Finally, we describe several interesting objects discovered among our eclipsing binary candidates, and illustrate the use of our publicly available light-curve catalog by tracing Galaxy halo substructure with our small sample of RR Lyrae variables.2010ApJS..186..233Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/186/233CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/AJ/115/296 : SDSS new variables (Henden+ 1998)J/AJ/130/1640 : Photometry of candidate RR Lyrae stars in the SDSS (Wu+, 2005)J/A+A/510/A100 : Four new SDSS eclipsing systems (Southworth+, 2010)http://shrike.pha.jhu.edu/stripe82-variables : SDSS Stripe 82 Variable Starshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/186/233https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/186/233http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/186/233https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/186/233https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/186/233http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/186/233GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/186/233/var82 (Variables in SDSS stripe 82)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/186/233/var82?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/186/233/var82?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/186/233/var82?GETtext/xml+votable180.050000true2.1891250.46227780.0055555555555555565/5786 6/1 2 17727 17746 17747 17752 17753 17755 17758 17761 17765 17769 17770 17772 17773 17774 17776 17777 17778 17811 17812 17814 17815 17817 17819 17820 17822 17827 17828 17831 17832 17836 17837 17841 18001 18008 18009 18011 18013 18022 18025 18026 18070 18073 18075 18078 18082 18083 18087 18089 18092 18098 18114 18178 23103 23150 23181 23182 23185 23186 23189 23193 23195 23196 23204 23205 23209 23210 23212 23214 23232 23233 36861 36862 368632.040811542443644e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/186/233?format=asciiOpticalInfrareddefaultJ/ApJS/186/233/var82Variables in SDSS stripe 82SDSSSDSS identification (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVarSimbad column added by the CDSmeta.code;src.varcharn_SDSS[ab ] confirmation of previous discovery (1)meta.notecharObsObservation numbermeta.idintumagSDSS median u-band magnitudemagphot.mag;em.opt.UfloatgmagSDSS median g-band magnitudemagphot.mag;em.opt.BfloatrmagSDSS median r-band magnitudemagphot.mag;em.opt.RfloatimagSDSS median i-band magnitudemagphot.mag;em.opt.IfloatzmagSDSS median z-band magnitudemagphot.mag;em.opt.IfloatPerPerioddtime.perioddoubleCommComments (SpType and noteworthy features of light curves for table 6, SpType for table 7)meta.notecharDR7Details from SDSS-DR7 photometric catalogmeta.ref.urlcharSloanDisplay the SDSS data for this starmeta.ref.urlchar_RA(from SDSS name) (right ascension part)degpos.eq.ra;meta.main_DE(from SDSS name) (declination part)degpos.eq.dec;meta.main