J/A+A/619/A116ivo://CDS.VizieR/J/A+A/619/A116doi:10.26093/cds/vizier.36190116CDSCrouzet N.Chapellier E.Guillot T.Mekarnia D.Agabi A.,Fantei-Caujolle Y.Abe L.Rivet J.-P.Schmider F.-X.Fressin F.,Bondoux E.Challita Z.Pouzenc C.Valbousquet F.Bayliss D.,Bonhomme S.Daban J.-B.Gouvret C.Blazit A.2018-12-03T15:25:38Z2018-11-15T07:34:55ZCDS support team

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

cds-question@unistra.frvariable-starsasteroseismologyDome C in Antarctica is a promising site for photometric observations thanks to the continuous night during the Antarctic winter and favorable weather conditions. We developed instruments to assess the quality of this site for photometry in the visible and to detect and characterize variable objects through the Antarctic Search for Transiting ExoPlanets (ASTEP) project. Here, we present the full analysis of four winters of data collected with ASTEP South, a 10cm refractor pointing continuously toward the celestial south pole. We achieved nearly continuous observations over the winters. We improved the instrument over the years and developed specific data reduction methods. We measure an average sky background of 20mag/arcsec^2^ in the 579-642nm bandpass. We built the lightcurves of 6000 stars and developed a model to infer the photometric quality of Dome C from the lightcurves themselves. The weather is photometric 67.1+/-4.2% of the time and veiled 21.8+/-2.0% of the time. The remaining time corresponds to poor quality data or winter storms.We analyzed the lightcurves of Oct and HD 184465 and find that the amplitude of their main frequency varies by a factor of 3.5 and 6.7 over the four years, respectively. We also identify 34 new variable stars and eight new eclipsing binaries with periods ranging from 0.17 to 81 days. The phase coverage that we achieved with ASTEP South is exceptional for a ground-based instrument and the data quality enables the detection and study of variable objects. These results demonstrate the high quality of Dome C for photometry in the visible and for time series observations in general.2018A&A...619A.116Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/619/A116CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/315 : UCAC3 Catalogue (Zacharias+ 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/619/A116https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/619/A116http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/619/A116https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/619/A116https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/619/A116http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/619/A116GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/619/A116/tablec1 (List of new variable stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/619/A116/tablec1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/619/A116/tablec1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/619/A116/tablec1?GETtext/xml+votable180.050000true202.96918333-88.371597220.005555555555555556Cone search capability for table J/A+A/619/A116/tablec2 (List of eclipsing binaries)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/619/A116/tablec2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/619/A116/tablec2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/619/A116/tablec2?GETtext/xml+votable180.050000true103.34309583-88.567855560.005555555555555556Cone search capability for table J/A+A/619/A116/listb (List of tables with sigma Ori and HD 184465 frequencies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/619/A116/listb?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/619/A116/listb?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/619/A116/listb?GETtext/xml+votable180.050000true317.1951667-88.95650.0055555555555555565/11264 6/32768 32770 36864-36866 36868 40960-40962 40968 45064https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/619/A116?format=asciidefaultJ/A+A/619/A116/tableb4Amplitude variations of three delta Scuti frequencies of HD 184465 over four wintersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDTime (JD-2450000)dtime.epochintA9.671Amplitude of the 9.671d^-1^ frequencymmagphot.magfloatA8.692Amplitude of the 8.692d^-1^ frequencymmagphot.magfloatA6.465Amplitude of the 6.465d^-1^ frequencymmagphot.magfloate_AAmplitude uncertainty (same for all amplitudes at a given time)mmagstat.errorfloatJ/A+A/619/A116/tableb2Amplitude of the ten main delta Scuti frequencies of sigma Oct over four wintersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqFrequencyd**-1em.freqdoublee_FreqFrequency uncertaintyd**-1stat.errordoubleA08Amplitude for the 2008 wintermmagphot.magfloate_A08Amplitude uncertainty for the 2008 wintermmagstat.errorfloatA09Amplitude for the 2009 wintermmagphot.magfloate_A09Amplitude uncertainty for the 2009 wintermmagstat.errorfloatA10Amplitude for the 2010 wintermmagphot.magfloate_A10Amplitude uncertainty for the 2010 wintermmagstat.errorfloatA11Amplitude for the 2011 wintermmagphot.magfloate_A11Amplitude uncertainty for the 2011 wintermmagstat.errorfloatA08-11Amplitude for the winters 2008 to 2011 togethermmagsrc.var.amplitudefloate_A08-11Amplitude uncertainty for the winters 2008 to 2011 togethermmagstat.errorfloatJ/A+A/619/A116/tableb3Amplitude of the ten main delta Scuti frequencies of HD 184465 over four wintersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqFrequencyd**-1em.freqdoublee_FreqFrequency uncertaintyd**-1stat.errordoubleA08Amplitude for the 2008 wintermmagphot.magfloate_A08Amplitude uncertainty for the 2008 wintermmagstat.errorfloatA09Amplitude for the 2009 wintermmagphot.magfloate_A09Amplitude uncertainty for the 2009 wintermmagstat.errorfloatA10Amplitude for the 2010 wintermmagphot.magfloate_A10Amplitude uncertainty for the 2010 wintermmagstat.errorfloatA11Amplitude for the 2011 wintermmagphot.magfloate_A11Amplitude uncertainty for the 2011 wintermmagstat.errorfloatA08-11Amplitude for the winters 2008 to 2011 togethermmagsrc.var.amplitudefloate_A08-11Amplitude uncertainty for the winters 2008 to 2011 togethermmagstat.errorfloatJ/A+A/619/A116/tablec1List of new variable starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDName of the source in the UCAC3 catalog (Cat. I/315)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainfmagUCAC3 magnitudemagphot.mag;em.optfloatFreqFrequencyd**-1em.freqdoublee_FreqFrequency uncertaintyd**-1stat.errordoublePerPerioddtime.periodfloatAmpAmplitudemmagphot.magfloate_AmpAmplitude uncertaintymmagstat.errorfloatTypeVariability type (1)meta.notecharJ/A+A/619/A116/tablec2List of eclipsing binariesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDName of the source in the UCAC3 catalog (Cat. I/315)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainfmagUCAC3 magnitudemagphot.mag;em.optfloatPerPerioddtime.perioddoublee_PerPeriod uncertaintydstat.errordoubleT0Time of mid-eclipse (BJD-2450000)dtime.epochdoublee_T0Time of mid-eclipse uncertaintydstat.errorfloatDepEclipse depthmmagsrc.var.amplitudefloate_DepEclipse depth uncertaintymmagstat.errorfloatTypeEclipsing binary typesrc.classcharNote[*] * indicates an individual note (1)meta.notecharJ/A+A/619/A116/listbList of tables with sigma Ori and HD 184465 frequenciesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainNameStar namemeta.id;meta.maincharFileName1Name of the file with frequenciesmeta.id;meta.filecharFileName2Name of the second file with frequenciesmeta.id;meta.filecharJ/A+A/619/A116/tableb121 main frequencies of sigma OctrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqFrequencyd**-1em.freqdoublee_FreqFrequency uncertaintyd**-1stat.errordoubleAmpAmplitudemmagphot.magfloate_AmpAmplitude uncertaintymmagstat.errorfloatPhasePhase (BJD-2454600) (1)radtime.phasefloate_PhasePhase uncertaintyradstat.error;time.phasefloat