J/AJ/167/18ivo://CDS.VizieR/J/AJ/167/18doi:10.26093/cds/vizier.51670018CDSHong K.Lee J.W.Kim D.-J.Park J.-H.Kim H.-Y.Rittipruk P.Han C.2024-11-06T20:19:44Z2024-05-13T08:26:32ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsgalactic-centervisible-astronomyspectroscopyWe present detailed analyses of updated eclipse timing diagrams for 32 contact binary merger candidates in the Galactic bulge. The photometric data was obtained from 2016 to 2021 using the Korea Microlensing Telescope Network with the 1.6 m telescopes located at three southern sites (CTIO, SAAO, and SSO). The times of minimum lights were determined by applying the binary-star model to full light curves created at half-year intervals from the observations. The orbital period variations of the binary systems were analyzed using the O-C diagrams from our new timings with the others published in the literature, which are based on the OGLE observations from 2001 to 2015. As results, the orbital periods and period-decreasing rates of 32 binary systems were located to be in the ranges of 0.370 to 1.238 days and from -3.0 to -13.1x10^-6^day/yr, respectively. Out of these stars, 24 systems show a combination effect of a parabola and a light travel time caused by a third body, and their outer orbital periods are in the range of 9.1-26.5yr. We propose that all of our merger candidates need additional monitoring observations to study a luminous-red nova progenitor.2024AJ....167...18Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/167/18CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/289/871 : YY Eri & AE Phe (Maceroni+, 1994)J/AJ/147/91 : Differential BVR light curves of V407 Peg (Lee+, 2014)J/AcA/66/405 : Galactic bulge eclipsing & ellipsoid binary (Soszynski+, 2016)J/AJ/158/185 : 3 binary systems in the Large Magellanic Cloud (Hong+, 2019)J/A+A/630/A75 : Six luminous red novae photometry (Pastorello+, 2019)J/AJ/163/157 : 14127 eclipsing binaries in the Galactic Bulge (Hong+, 2022)J/AJ/164/202 : Extremely Low Mass Ratio Contact Binaries. I. (Li+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/167/18https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/167/18http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/167/18https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/167/18https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/167/18http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/167/18GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/167/18/table4 (List of eclipse timings for 8 CEBs showing a parabolic variation)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/167/18/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/167/18/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/167/18/table4?GETtext/xml+votable180.050000true265.5131503-22.71286940.005555555555555556Cone search capability for table J/AJ/167/18/table5 (List of eclipse timings of 24 CEBs with the parabolic plus LTT ephemeris)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/167/18/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/167/18/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/167/18/table5?GETtext/xml+votable180.050000true266.240125-34.290250.0055555555555555565/7216 6/28718-28719 28731-28732 28734-28735 28777-28779 28817 28820-28821 28823 28869-28871 28882-28883 29252https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/167/18?format=asciiOpticaldefaultJ/AJ/167/18/table4List of eclipse timings for 8 CEBs showing a parabolic variationSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameOGLE name; OGLE-BLG-meta.id;meta.maincharHJD[2450/9442] Heliocentric Julian Date HJD-2450000dtime.epochdoublee_HJD[0.001/0.02] Uncertainty in HJDdstat.error;time.epochfloatCycle[-7704/4134] Cycle of binary systemobs.proposal.cycleintO-C1[-0.28/0.008] O-C1 value (1)dstat.valuedoubleO-C2[-0.03/0.02] O-C2 value (1)dstat.valuedoubleInstInstrument usedinstr.setupcharNobs[31/2016] Number of observationsmeta.numberint_RAPosition from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad (declination part)degpos.eq.dec;meta.mainJ/AJ/167/18/table5List of eclipse timings of 24 CEBs with the parabolic plus LTT ephemerisSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameOGLE name; OGLE-BLG-meta.id;meta.maincharHJD[2133/9441] Heliocentric Julian Date HJD-2450000dtime.epochdoublee_HJD[0.0002/0.01] Uncertainty in HJDdstat.error;time.epochfloatCycle[-11230/6597] Cycle of binary systemobs.proposal.cycledoubleO-C1[-0.19/0.03] O-C1 value (1)dstat.valuedoubleO-C2[-0.05/0.04] O-C2 value (1)dstat.valuedoubleO-C3[-0.02/0.02] O-C3 value (1)dstat.fit.residualdoubleInstInstrument usedinstr.setupcharNobs[31/2350] Number of observationsmeta.numberint_RAPosition from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad (declination part)degpos.eq.dec;meta.main