J/AJ/156/220ivo://CDS.VizieR/J/AJ/156/220doi:10.26093/cds/vizier.51560220CDSLong L.Zhang L.-Y.Han X.L.Lu H.-P.Pi Q.-F.Yue Q.2019-05-06T15:36:50Z2019-04-25T13:07:23ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsm-starsinfrared-photometryvisible-astronomyphotometryWe performed multicolor photometric and spectroscopic observations of four new low-mass M-type eclipsing binaries (HAT 225-03429, CRTS J085623.0+282620, CRTS J110302.4+201611, 2MASS J16344899+3716423) in 2017. We obtained new VRI light curves and minimum times of these four systems. Based on our minimum times, we updated the orbital periods and the linear ephemerides using the least squares method. We analyzed these four systems using the Wilson-Devinney program, and obtained the orbital and starspot parameters. The results of our analysis of the light curves indicate that HAT 225-03429 and CRTS J085623.0+282620 are detached eclipsing binaries, CRTS J110302.4+201611 is a semi-detached eclipsing binary, and 2MASS J16344899+3716423 is a contact binary. We performed LAMOST spectroscopic studies of chromospheric activity indicators (H{alpha}, H{beta}, H{gamma}, H{delta}, and Ca II H&K lines) for these four systems for the first time. We first determined their spectral types and calculated the equivalent widths of their chromospheric active indicators. These indicators show that the four low-mass M-type eclipsing binaries are active. Furthermore, the radii of these stars are notably larger than model predictions for their masses, except for the secondary component of HAT 225-03429 and the primary component of CRTS J110302.4+201611.2018AJ....156..220Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/156/220CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/684/635 : New low-mass eclipsing binary from SDSS-II (Blake+, 2008)J/AJ/141/78 : Low-mass eclipsing binaries in KIC (Coughlin+, 2011)J/MNRAS/426/1507 : Detached M dwarf eclipsing binaries in WTS (Birkby+, 2012)J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)J/MNRAS/442/2620 : VRI light curve of 5 eclipsing binaries (Zhang+, 2014)J/MNRAS/469/3688 : CSS Periodic Variable Star Catalogue (Drake+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/156/220https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/156/220http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/156/220https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/156/220https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/156/220http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/156/220GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/156/220/table1 (Basic properties for four low-mass M-type eclipsing binaries)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/156/220/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/156/220/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/156/220/table1?GETtext/xml+votable180.050000true140.36833.43288890.0055555555555555566/4926 4988 9457 28316https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/156/220?format=asciiOpticalInfrareddefaultJ/AJ/156/220/table1Basic properties for four low-mass M-type eclipsing binariesLCLight curvesmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharCSSCatalina Sky Survey identifier (CSS_JHHMMSS.s+DDMMSS)meta.idcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVmagavg[14.06/14.72] Average V band magnitude from Adaptive Fourier Decomposition (AFD)magphot.mag;em.opt.VfloatPer[0.246723/0.42647] Period (fundamental P_F_)dtime.perioddoubleVamp[0.1/0.24] Amplitude from AFDmagphot.magfloatTypeType of periodic variablemeta.code;src.varcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/156/220/table3Observational data of the four low-mass M-type eclipsing binaries obtained in 2017recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharHDJ-V? Heliocentric Julian Date of V band observationdtime.epoch;obsdoublenullableDVmag[1.576/3.573]? Differential V band magnitudemagphot.mag;em.opt.V;arith.difffloatnullableHDJ-R? Heliocentric Julian Date of R band observationdtime.epoch;obsdoublenullableDRmag[0.897/3.051]? Differential R band magnitudemagphot.mag;em.opt.R;arith.difffloatnullableHDJ-I? Heliocentric Julian Date of I band observationdtime.epoch;obsdoublenullableDImag[-0.172/2.441]? Differential I band magnitudemagphot.mag;em.opt.I;arith.difffloatnullable