J/A+AS/125/407ivo://CDS.VizieR/J/A+AS/125/407CDSAkalin A.Derman E.1998-01-03T14:55:01Z1998-01-03T15:54:44ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsvisible-astronomyWide-band photometryA complete period variation analysis and new light curves of V839 Oph together with new ephemeris data are presented. The period variation was found to be dP/dt=3.1x10^-7d/yr. The period increament indicates that the conservative mass transfer rate from the less massive component to the more massive one is 6.5x10^-7M_sun_/yr. We fitted parabolic and we discuss the possible detection of sinusoidal curves to the (O-C) diagram and sinusoidal oscillations with period of about 20yr and semi-amplitude of 0.0065 day. A simultaneous solution of the B and V light curves was computed using the Wilson-Devinney synthetic light-curve code. The light curve solution indicates that the A-type W UMa-type system is in contact with a filling factor of ~39%.1997A&AS..125..407Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/125/407CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/125/407https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/125/407http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/125/407https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/125/407https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/125/407http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/125/407GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+AS/125/407/table2The data for light curves and colours of V839 Oph between 1989 and 1994recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian daydtime.epochdoubleDVmag? Diferential V magnitude (1)magphot.mag;arith.difffloatDBmag? Diferential B magnitude (1)magphot.mag;arith.difffloatDUmag? Diferential U magnitude (1)magphot.mag;arith.difffloatD(B-V)? Diferential (B-V) colourmagphot.color;arith.difffloatD(U-B)? Diferential (U-B) colourmagphot.color;arith.difffloatJ/A+AS/125/407/table5Epochs of minimum light of V839 OphTypeType of the minimummeta.code;src.varintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDMinHeliocentric Julian day at minimum lightdtime.epochdoubleDataData used to find the minimum (1)meta.codecharEpochEpoch numberdtime.epochdouble(O-C)Linear ephemerisdstat.fit.omc;timedouble(O-C)'qResiduals from the quadratic ephemerisdstat.fit.omc;timedouble(O-Cs)'Residuals from the best fitdstat.fit.omc;timedoubleRefSource of the minima time (2)meta.refint