J/AJ/143/13ivo://CDS.VizieR/J/AJ/143/13doi:10.26093/cds/vizier.51430013CDSYang Y.-G.Li H.-L.Dai H.-F.2017-06-21T08:22:33Z2013-04-12T09:29:36ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomyphotometryccd-photometryWe present the CCD photometry of two Algol-type binaries, AL Gem and BM Mon, observed from 2008 November to 2011 January. With the updated Wilson-Devinney program, photometric solutions were deduced from their EA-type light curves. The mass ratios and fill-out factors of the primaries are found to be q_ph_=0.090(+/-0.005) and f_1_=47.3%(+/-0.3%) for AL Gem, and q_ph_=0.275(+/-0.007) and f_1_=55.4%(+/-0.5%) for BM Mon, respectively. By analyzing the O-C curves, we discovered that the periods of AL Gem and BM Mon change in a quasi-sinusoidal mode, which may possibly result from the light-time effect via the presence of a third body. Periods, amplitudes, and eccentricities of light-time orbits are 77.83(+/-1.17)yr, 0.0204(+/-0.0007)d, and 0.28(+/-0.02) for AL Gem and 97.78(+/-2.67)yr, 0.0175(+/-0.0006)d, and 0.29(+/-0.02) for BM Mon, respectively. Assumed to be in a coplanar orbit with the binary, the masses of the third bodies would be 0.29M_{sun}_ for AL Gem and 0.26M_{sun}_ for BM Mon. This kind of additional companion can extract angular momentum from the close binary orbit, and such processes may play an important role in multiple star evolution.2012AJ....143...13Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/143/13CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2012)B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2013)J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)J/AJ/117/587 : Apsidal motion in double stars. I. (Petrova+, 1999)J/other/IBVS/5493 : 2003 CCD minima of eclipsing binaries (Nelson+, 2004)J/other/IBVS/5543 : 163-nd list of minima of EBs (Diethelm, 2004)J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)J/other/IBVS/5592 : Eclipsing binary stars photoelectric minima (Krajci+, 2005)J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)J/MNRAS/378/179 : EBs with eccentric orbits catalog (Bulut+, 2007)J/other/IBVS/5802 : Minima and maxima of 735 variables (Hubscher+, 2007)J/AJ/137/226 : Differential light curves of TV Tri - Paper I (Yang+, 2009)J/AJ/139/1360 : AO Ser VR light curves - Paper II (Yang+, 2010)J/other/IBVS/5918 : Minima and maxima of 452 variables (Hubscher+, 2010)J/other/JAVSO/38.183 : Time of minima of eclipsing binaries (Samolyk+, 2010)J/other/IBVS/5984 : Minima and maxima of 503 variables (Hubscher, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/143/13https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/143/13http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/143/13https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/143/13https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/143/13http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/143/13GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/143/13/table2aVR photometric observations of AL GemrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-VAL Gem V band Heliocentric Julian Datedtime.epochdoubleDVmagAL Gem differential V band magnitudemagphot.mag;arith.difffloatHJD-R? AL Gem R band Heliocentric Julian Datedtime.epochdoublenullableDRmag? AL Gem differential R band magnitudemagphot.mag;arith.difffloatnullableJ/AJ/143/13/table2bVR photometric observations of BM MonrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-VAL Gem V band Heliocentric Julian Datedtime.epochdoubleDVmagAL Gem differential V band magnitudemagphot.mag;arith.difffloatHJD-R? AL Gem R band Heliocentric Julian Datedtime.epochdoublenullableDRmag? AL Gem differential R band magnitudemagphot.mag;arith.difffloatnullableJ/AJ/143/13/table6All collected light minimum times of the eclipsing binary BM MonrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleEpochEpoch in cyclesmeta.number;time.perioddoubleMethDetection method (CCD, pe, p, vi or pg) (1)meta.code;obscharMinMinimum type (I or II)meta.codenullableO-CThe (O-C) value (2)magstat.fit.residualfloatRes? Residual of the fitmagstat.fit.residualfloatnullableRef[1/84] Reference, in refs.dat filemeta.ref;pos.frame;meta.fileintJ/AJ/143/13/table4All compiled light minimum times of the eclipsing binary AL GemrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleEpochEpoch in cyclesmeta.number;time.perioddoubleMethDetection method (CCD, pe, p, vi or pg) (1)meta.code;obscharMinMinimum type (I or II)meta.codenullableO-CThe (O-C) value (2)magstat.fit.residualfloatRes? Residual of the fitmagstat.fit.residualfloatnullableRef[1/84] Reference, in refs.dat filemeta.ref;pos.frame;meta.fileintJ/AJ/143/13/refsReferencesAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/84] Reference numbermeta.id;meta.mainintprimaryBibCodeBibliographic codemeta.bib.bibcodechar