J/AJ/147/145ivo://CDS.VizieR/J/AJ/147/145doi:10.26093/cds/vizier.51470145CDSYang Y.-G.Yang Y.Li S.-Z.2017-07-03T14:27:15Z2014-10-15T12:50:42ZCDS 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-photometryNew extensive photometry for two triple binary stars, DI Peg and AF Gem, was performed from 2012 October to 2013 January, with two small telescopes at Xinglong station (XLs) of NAOC. From new multi-color observations and previously published ones in literature, the photometric models were (re)deduced using the updated Wilson-Devinney code. The results indicated that the low third lights exist in two classic Algol-type binaries, whose fill-out factors for the more massive components are f_p_=78.2(+/-0.4)% for DI Peg, and f_p_=69.0(+/-0.3)% for AF Gem, respectively. Through analyzing the O-C curves, the orbital periods for two binaries change in the complicated mode. The period of DI Peg possibly appears to show two light-time orbits, whose modulated periods are P_3_=54.6(+/-0.5)yr and P_4_=23.0(+/-0.6)yr, respectively. The inferred minimum masses for the inner and outer sub-stellar companions are M_in_=0.095M_{sun}_ and M_out_=0.170M_{sun}_, respectively. Therefore, DI Peg may be a quadruple star. The orbital period of AF Gem appears to show a continuous period decrease or a cyclic variation; the latter may be preferable. The cyclic oscillation, with a period of 120.3(+/-2.5)yr, may be attributed to the light-time effect due to the third body. This kind of additional companion may extract angular momentum from the central system, which may play a key role in the evolution of the binary.2014AJ....147..145Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/147/145CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2013)J/AJ/147/66 : Algol-type binaries light curves. VII. V404 And (Zhang+, 2014)J/AJ/147/35 : Light curves of Algol-type binaries. VI. FR Ori (Yang+, 2014)J/AJ/144/136 : Light curves of the Algol-type binary V1241 Tauri (Yang+, 2012)J/AJ/144/50 : Light curves of AV Hya and DZ Cas (Yang+, 2012)J/AJ/143/13 : Light curves of AL Gem and BM Mon (Yang+, 2012)J/AJ/139/1360 : AO Ser VR light curves (Yang+, 2010)J/AJ/137/226 : Differential light curves of TV Tri (Yang+, 2009)J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/147/145https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/147/145http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/147/145https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/147/145https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/147/145http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/147/145GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/147/145/stars (The two Algol-type binaries DI Peg and AF Gem)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/147/145/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/147/145/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/147/145/stars?GETtext/xml+votable180.050000true353.061121914.96909470.0055555555555555566/19991 24004https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/147/145?format=asciiOpticalInfrareddefaultJ/AJ/147/145/refs*ReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/315] Reference identifiermeta.refintprimaryBibCodeBibliographic codemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/AJ/147/145/table1Photometric observations for two Algol-type binaries DI Peg and AF GemrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameVariable name (AF Gem or DI Peg)meta.id;meta.maincharHJD-B? B band Heliocentric Julian Datedtime.epochdoublenullableDBmag? Differential B band magnitudemagphot.mag;em.opt.B;arith.difffloatnullableHJD-V? V band Heliocentric Julian Datedtime.epochdoublenullableDVmag? Differential V band magnitudemagphot.mag;em.opt.V;arith.difffloatnullableHJD-R? R band Heliocentric Julian Datedtime.epochdoublenullableDRmag? Differential V band magnitudemagphot.mag;em.opt.V;arith.difffloatnullableJ/AJ/147/145/minimaMinimum light times of DI Peg and AF GemEpochEpochtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSimbad column added by the CDSmeta.id;meta.maincharHJDHeliocentric Julian Datedtime.epochdoubleMethObservational method used (1)instr.setupcharMinMinimum type (I or II)meta.codecharO-C1Eclipse time residual (O-C)_1_ (2)dstat.fit.residualfloatO-C2Eclipse time residual (O-C)_2_ (3)dstat.fit.residualfloatO-C3? Eclipse time residual (O-C)_3_ (4)dstat.fit.residualfloatnullableRef[1/315] Reference; in refs.dat filemeta.ref;pos.frameintJ/AJ/147/145/starsThe two Algol-type binaries DI Peg and AF GemLCShow the Light curvesmeta.ref.urlcharPerPerioddtime.perioddoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the variablemeta.id;meta.maincharprimarySimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main