J/A+A/456/599ivo://CDS.VizieR/J/A+A/456/599doi:10.26093/cds/vizier.34560599CDSPapadaki C.Boffin H.M.J.Sterken C.Stanishev V.Cuypers J.,Boumis P.Akras S.Alikakos J.2017-06-26T11:49:42Z2006-09-19T11:56:56ZCDS support team

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

cds-question@unistra.frvariable-starsphotometryWe present time-resolved photometry of five relatively poorly-studied cataclysmic variables: V1193 Ori, LQ Peg, LD 317, V795 Her and MCT 2347-3144. The observations were made using four 1m-class telescopes for a total of more than 250h of observation and almost 16,000 data points. For LQ Peg WHT spectroscopic data have been analysed as well. The light curves show a whole range of variability on different time scales, from minutes to months. We detect for the first time a brightness variation of 0.05mag in amplitude in V1193 Ori on the same timescale as the orbital period, that we interpret as the result of the irradiation of the secondary. A 20-min Quasi-Periodic Oscillation is also detected. The mean brightness of the system has changed by 0.5mag on a three month interval, while the flickering was halved. In LQ Peg a 0.05mag modulation was revealed with a period of about 3h. The flickering was much smaller, of the order of 0.025mag. A possible Quasi-Periodic Oscillation could exist near 30min. For this object, the WHT spectra are single peaked and do not show any radial-velocity variations. The data of LD 317 show a decrease in the mean magnitude of the system. No periodic signal was detected but this is certainly attributable to the very large flickering observed: between 0.07 and 0.1mag. For V795 Her, the 2.8-hour modulation, thought to be a superhump arising from the precession of the disc, is present. We show this modulation not to be stable in terms of periodicity, amplitude and phase. Finally, for MCT 2347-3144, a clear modulation is seen in a first dataset obtained in October 2002. This modulation is absent in August 2003, when the system was brighter and showed much more flickering.2006A&A...456..599Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/456/599CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/456/599https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/456/599http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/456/599https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/456/599https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/456/599http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/456/599GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/456/599/tablea1Log of observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCataclysmic variable namemeta.id;meta.maincharUTUT date at beginning of the nighttime.epochcharSiteObserving site (1)meta.code;obscharHJDstartHeliocentric Julian Date at startdtime.epochdoubleDurDuration of observing runhtime.epochfloatBand[RV-] Band used (2)instr.bandpasscharJ/A+A/456/599/table1Long-term behaviour of three CVsUTUT datetime.epochcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStar[a-c] Flag for the star observed (1)meta.code.errorchar<mag>Mean nightly magnitude of our objectmagphot.magfloate_<mag>Error in mean(CV)magstat.error;phot.magfloat<shift>Nightly mean of the shift between 2comp. starsmagphot.mag;stat.meanfloate_<shift>Error in mean(shift)magstat.error;phys.atmol.lineShiftfloatJ/A+A/456/599/figa2V1193 Ori light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeNumber of days after the beginning of observation (1)dmeta.numberdoublemag? Magnitude (2)magphot.magfloatnullableJ/A+A/456/599/figa3LQ Peg light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeNumber of days after the beginning of observation (1)dmeta.numberdoublemag? Magnitude (2)magphot.magfloatnullableJ/A+A/456/599/figa5V795 Her light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeNumber of days after the beginning of observation (1)dmeta.numberdoublemag? Magnitude (2)magphot.magfloatnullableJ/A+A/456/599/figa6MCT 2347-3144 light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeNumber of days after the beginning of observation (1)dmeta.numberdoublemag? Magnitude (2)magphot.magfloatnullableJ/A+A/456/599/figa4LD 317 light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeNumber of days after the beginning of observation (1)dmeta.numberdoublemag? Magnitude (2)magphot.magfloatnullable