J/AJ/147/50ivo://CDS.VizieR/J/AJ/147/50doi:10.26093/cds/vizier.51470050CDSPi Q.-F.Zhang L.-Y.Li Z.-M.Zhang X.-L.2026-03-18T11:42:59Z2014-09-08T15:09:26ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomyWide-band photometryccd-photometryWe present six new BVR_c_I_c_ CCD light curves of a short-period RS CVn binary DV Psc obtained in 2010-2012. The light curve distortions change on both short and long timescales, which is explained by two starspots on the primary component. Moreover, five new flare events were detected and the flare ratio of DV Psc is about 0.082 flares per hour. There is a possible relation between the phases (longitude) of the flares and starspots for all of the available data of late-type binaries, which implies a correlation of the stellar activity of the spots and flares. The cyclic oscillation, with a period of 4.9+/-0.4yr, may result from the magnetic activity cycle, identified by the variability of Max.I-Max.II. Until now, there were no spectroscopic studies of chromospheric activity indicators of the H_{beta}_and H_{gamma}_lines for DV Psc. Our observations of these indicators show that DV Psc is active, with excess emissions. The updated O-C diagram with an observing time span of about 15yr shows an upward parabola, which indicates a secular increase in the orbital period of DV Psc. The orbital period secularly increases at a rate of dP/dt=2.0x10^-7^days/yr, which might be explained by the angular momentum exchanges or mass transfer from the secondary to primary component.2014AJ....147...50Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/147/50CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/147/50https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/147/50http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/147/50https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/147/50https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/147/50http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/147/50GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/147/50/table3BVR_c_ and I_c_ photometric data of DV Psc taken in 2008, 2010, 2011, and 2012recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintYearYear of the observationyrtime.epochintMonthMonth of the observationmonthtime.epochintDayDay(s) of the observationdtime.epochcharHJD-B? Heliocentric Julian Date of B band observationdtime.epochdoublenullableDBmag? Differential Johnson B band magnitude (1)magphot.mag;arith.difffloatnullableHJD-V? Heliocentric Julian Date of V band observationdtime.epochdoublenullableDVmag? Differential Johnson V band magnitude (1)magphot.mag;arith.difffloatnullableHJD-R? Heliocentric Julian Date of R band observationdtime.epochdoublenullableDRmag? Differential Cousins R band magnitude (1)magphot.mag;arith.difffloatnullableHJD-I? Heliocentric Julian Date of I band observationdtime.epochdoublenullableDImag? Differential Cousins I band magnitude (1)magphot.mag;arith.difffloatnullableJ/AJ/147/50/table4Newly obtained times of minimum light of DV PscrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-BHeliocentric Julian Date of B band observationdtime.epochdoublee_HJD-BUncertainty in HJD-Bdstat.errordoubleHJD-V? Heliocentric Julian Date of V band observationdtime.epochdoublenullablee_HJD-V? Uncertainty in HJD-Vdstat.errordoublenullableHJD-RHeliocentric Julian Date of R band observationdtime.epochdoublee_HJD-RUncertainty in HJD-Rdstat.errordoubleHJD-IHeliocentric Julian Date of I band observationdtime.epochdoublee_HJD-IUncertainty in HJD-Idstat.errordouble<HJD>Mean Heliocentric Julian Date in the BVRI bandsdtime.epochdoublee_<HJD>Uncertainty in <HJD>dstat.error;time.epochfloatTypeMinimum type (Pri=primary, Sec=secondary)meta.notecharJ/AJ/147/50/table5The minimum times of DV PscrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Date (HJD-2400000) (1)dtime.epochdoublee_HJDUncertainty in HJDdstat.error;time.epochfloatf_HJD[*] The data from O-C gateway by mark (*) (2)meta.codecharCycle[-8483/7202] Cycle numbermeta.id;meta.mainfloatO-C1The (O-C)_1_ residualdstat.fit.residualfloatO-C2The (O-C)_2_ residualdstat.fit.residualfloatRefReference; in refs.dat filemeta.ref;pos.frameintJ/AJ/147/50/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintprimaryBibCodeBibliographic codemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar