J/AN/333/706ivo://CDS.VizieR/J/AN/333/706doi:10.26093/cds/vizier.113330706CDSHaas M.Hackstein M.Ramolla M.Drass H.Watermann R.Lemke R.,Chini R.2025-09-29T20:17:56Z2013-05-23T14:50:19ZCDS support team

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

cds-question@unistra.frsurveysvariable-starsphotometryWe are monitoring a 6{deg} wide stripe along the southern Galactic disk simultaneously in the r and i bands, using a robotic 15-cm twin telescope of the Universitatsternwarte Bochum near Cerro Armazones in Chile. Utilising the telescope's 2.7{deg} field of view, the survey aims at observing a mosaic of 268 fields once per month and to monitor dedicated fields once per night. The survey reaches a sensitivity from 10m down to 18m (AB system), with a completeness limit of r~15.5m and i~14.5m which - due to the instrumental pixel size of 2.4" - refers to stars separated by >3". This brightness range is ideally suited to examine the intermediately bright stellar population supposed to be saturated in deep variability surveys with large telescopes. To connect to deep surveys or to explore faint long term variables, coadded images of several nights reach a depth of ~20m. The astrometric accuracy is better than 1", as determined from the overlap of neighbouring fields. We describe the survey design, the data properties and our procedures to derive the light curves and to extract variable stars. We present a list of ~2200 variable stars identified in 50 square degrees with 50-80 observations between May and October 2011. For bright stars the variability amplitude A reaches down to A~0.05m, while at the faint end variations of A>1m are detected. About 200 stars were known to be variable, and their amplitudes and periods - as far as determinable from our six month monitoring - agree with literature values, demonstrating the performance of the Bochum Galactic Disk Survey.2012AN....333..706Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AN/333/706CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AN/333/706https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AN/333/706http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AN/333/706https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AN/333/706https://vizier.iucaa.in/viz-bin/votable?-source=J/AN/333/706http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AN/333/706GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AN/333/706/table1 (List of fields in Galactic Disk Survey (GDS))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AN/333/706/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AN/333/706/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AN/333/706/table1?GETtext/xml+votable180.050000true240.285833-51.8686110.005555555555555556Cone search capability for table J/AN/333/706/table2 (List of variable stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AN/333/706/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AN/333/706/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AN/333/706/table2?GETtext/xml+votable180.050000true238.50349111-52.592913890.0055555555555555565/7202 7206-7207 7228 10543 10554 10556 10595 10599 10611 10615 10625 6/28802 28813-28815 28822-28823 28832 28837 28839 28848-28850 28852-28853 28855 28872 28874-28875 28879 28890-28891 28896 28900-28901 28903 28920 42158-42159 42169-42171 42203 42206-42207 42209-42212 42214-42215 42220 42228-42230 42374 42377-42379 42391-42392 42400-42401 42404-42405 42421 42434 42439-42442 42450 42455-42458 42469 42485 42497-42499 42505 42508 42512-42513 42516https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AN/333/706?format=asciiOpticaldefaultJ/AN/333/706/table1List of fields in Galactic Disk Survey (GDS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldGDS field name (NNNN-NNNN)obs.fieldcharprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainNObsNumber of observationsmeta.numberintObs1First night observation datetime.epoch;obsnullableObs2Las2 night observation datetime.epoch;obsnullableNsrNumber of stars used for the analysis in r-bandmeta.numberintNvr[70/238] Number of stars identified to be variable in r-bandmeta.numberintNsiNumber of stars used for the analysis in i-bandmeta.numberintNvi[91/248] Number of stars identified to be variable in i-bandmeta.numberintJ/AN/333/706/table2List of variable starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField name of the data set from which the light curve is created (NNNN-NNNN)obs.fieldcharRAJ2000Star right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Star declination (J2000)degpos.eq.dec;meta.mainNr[14/57]? Number of data points of the light curve used in the r-bandmeta.numberintnullable<rmag>? Mean brightness of the light curve in rmag (AB system)magphot.mag;em.opt.Rfloatnullablee_<rmag>? Standard deviation on <rmag>magstat.error;phot.mag;em.opt.RfloatnullableTrs[0.02/0.5]? Threshold at the brightness of the star to accept it as variable by means of the standard deviation in r-bandmaginstr.sensitivityfloatnullablerAmp? Amplitude of the light curve in r-bandmagsrc.var.amplitudefloatnullableTrA[0.07/2.0]? Threshold at the brightness of the star to accept it as variable by means of the amplitude in r-bandmaginstr.sensitivityfloatnullableJr? Stetson J-Index in r-bandsrc.var.indexfloatnullableNi[14/42]? Number of data points of the light curve used in the i-bandmeta.numberintnullable<imag>? Mean brightness of the light curve in imag (AB system)magphot.mag;em.opt.Ifloatnullablee_<imag>? Standard deviation on <imag>magstat.error;phot.mag;em.opt.IfloatnullableTis[0.02/0.5]? Threshold at the brightness of the star to accept it as variable by means of the standard deviation in i-bandmaginstr.sensitivityfloatnullableiAmp? Amplitude of the light curve in imagmagsrc.var.amplitudefloatnullableTiA[0.07/2.0]? Threshold at the brightness of the star to accept it as variable by means of the amplitude in i-bandmaginstr.sensitivityfloatnullableJi? Stetson J-index in i-bandsrc.var.indexfloatnullable