J/AJ/149/50ivo://CDS.VizieR/J/AJ/149/50doi:10.26093/cds/vizier.51490050CDSOelkers R.J.Macri L.M.Wang L.Ashley M.C.B.Cui X.Feng L.-L.,Gong X.Lawrence J.S.Qiang L.Luong-Van D.Pennypacker C.R.Yang H.,Yuan X.York D.G.Zhou X.Zhu Z.2017-12-05T05:11:06Z2015-04-15T06:40:52ZCDS support team

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

cds-question@unistra.frvariable-starssouth-galactic-polevisible-astronomysloan-photometryThe Chinese Small Telescope ARray carried out high-cadence time-series observations of 27 square degrees centered on the South Celestial Pole during the Antarctic winter seasons of 2008-2010. Aperture photometry of the 2008 and 2010 i-band images resulted in the discovery of over 200 variable stars. Yearly servicing left the array defocused for the 2009 winter season, during which the system also suffered from intermittent frosting and power failures. Despite these technical issues, nearly 800000 useful images were obtained using g, r, and clear filters. We developed a combination of difference imaging and aperture photometry to compensate for the highly crowded, blended, and defocused frames. We present details of this approach, which may be useful for the analysis of time-series data from other small-aperture telescopes regardless of their image quality. Using this approach, we were able to recover 68 previously known variables and detected variability in 37 additional objects. We also have determined the observing statistics for Dome A during the 2009 winter season; we find the extinction due to clouds to be less than 0.1 and 0.4mag for 40% and 63% of the dark time, respectively.2015AJ....149...50Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/50CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2012)I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)J/AJ/146/139 : 2010 photometry of variable stars from Dome A (Wang+, 2013)J/AJ/142/155 : Variable stars photometry from Dome A (Wang+, 2011)J/PASP/122/347 : Chinese Small Telescope ARray (CSTAR) (Zhou+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/50https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/50http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/50https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/50https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/50http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/50GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/149/50/table4 (Variable stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/50/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/50/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/50/table4?GETtext/xml+votable180.050000true195.4933333-87.66563890.0055555555555555565/8192 9216 10240 11264 6/32772 32776 32778 36868 36872 40964 40968 45060 45062 450642.381800341673347e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/149/50?format=asciiOpticaldefaultJ/AJ/149/50/table4Variable starsSimbadNameSimbad column added by the CDSmeta.idcharGSCIdentifier from the Guide Star Catalog (1)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCSTARCSTAR identifiermeta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainimag? Standard SDSS i-band magnitudemagphot.mag;em.opt.Ifloatnullablegmag? Standard SDSS g-band magnitudemagphot.mag;em.opt.Bfloatnullablermag? Standard SDSS r-band magnitudemagphot.mag;em.opt.Rfloatnullablemag? Magnitude from a clear filtermagphot.mag;em.optfloatnullableTypeType of variable (2)meta.code;src.varcharPer? Perioddtime.perioddoublenullableRefCatalog of reference (3)meta.ref;pos.frame;meta.tablechar