J/MNRAS/524/1826ivo://CDS.VizieR/J/MNRAS/524/1826doi:10.26093/cds/vizier/bg-gc-1s2CDSOrcajo S.Cieza L.A.Gamen R.2026-08-03T07:32:56Z2023-09-05T11:44:00ZCDS support team

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

cds-question@unistra.fropen-star-clustersvariable-starsphotometryvisible-astronomyUsing the Las Cumbres Observatory Global Telescope Network (LCOGT), we have obtained multi-epoch photometry of the young cluster Mon R2. We have monitored over 6000 sources with i-band between 13 and 23 mag within a 26x26 arcmin^2^ field of view. For each star, we collected ~1500 photometric points covering a temporal window of 23d. Based on these data, we have measured rotation-modulated of 136 stars and identified around 90 additional variables, including 14 eclipsing binary candidates. Moreover, we found 298 other variables with photometric high-scatter. In addition, we have obtained r-band and H{alpha} narrow-band photometry of the cluster with LCOGT and low-resolution optical spectroscopy of 229 stars with GMOS-Gemini. We used the Gaia data from the periodic stars and objects with H{alpha} or IR-excesses, which are mostly low-mass pre-main sequence stars (<1M_{sun}_) in the cluster to estimate the distance (825+/-51pc) and the mean proper motions ({mu}_{alpha}cos}({delta})=-2.75mas/yr and {mu}_{delta}_=1.15mas/yr) of its members. This allows us to use the Gaia data to identify additional Mon R2 member candidates. We also used Pan-STARRS photometry from our LCOGT sources to construct a more precise H-R diagram, from which we estimate the mean age of the cluster and identify other possible members including eleven spectroscopy brown dwarf with M7 to M9 GMOS spectral types. Finally, we combined our membership lists with Spitzer infrared photometry to investigate the incidence of stars with discs and the effect these have on stellar rotation.2023MNRAS.524.1826Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/524/1826CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)II/368 : The Spitzer (SEIP) source list (SSTSL2) (Spitzer Science Center, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/524/1826https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/524/1826http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/524/1826https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/524/1826https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/524/1826http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/524/1826GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/524/1826/spitzer (Spitzer data (table F1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/524/1826/spitzer?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/524/1826/spitzer?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/524/1826/spitzer?GETtext/xml+votable180.050000true91.79923-6.568830.005555555555555556Cone search capability for table J/MNRAS/524/1826/colour (Colour excess values for 124 sources (table F3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/524/1826/colour?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/524/1826/colour?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/524/1826/colour?GETtext/xml+votable180.050000true91.88215-6.548640.005555555555555556Cone search capability for table J/MNRAS/524/1826/memcand (Objects with spectral type but not fulfilling the membership criteria (table F4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/524/1826/memcand?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/524/1826/memcand?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/524/1826/memcand?GETtext/xml+votable180.050000true91.86232-6.163120.005555555555555556Cone search capability for table J/MNRAS/524/1826/bdcand (BD candidates (table F6))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/524/1826/bdcand?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/524/1826/bdcand?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/524/1826/bdcand?GETtext/xml+votable180.050000true91.97295-6.563930.005555555555555556Cone search capability for table J/MNRAS/524/1826/listlc (List of light curves)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/524/1826/listlc?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/524/1826/listlc?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/524/1826/listlc?GETtext/xml+votable180.050000true91.9294-6.16240.0055555555555555566/21447 21456 21458 38954https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/524/1826?format=asciiOpticaldefaultJ/MNRAS/524/1826/spitzerSpitzer data (table F1)IdInternal identification numbermeta.id;meta.mainfloatRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.main[3.6]Spitzer flux in magnitude for band [3.6], in 3.6 aperturemagphot.mag;em.IR.3-4umdoublee_[3.6]Error in band [3.6]magstat.errordouble[4.5]? Spitzer flux in magnitude for band [4.5], in 3.6 aperturemagphot.mag;em.IR.4-8umdoublenullablee_[4.5]? Error in band [4.5]magstat.errordoublenullable[5.8]? Spitzer flux in magnitude for band [5.8], in 3.6 aperturemagphot.flux.density;em.IR.4-8umdoublenullablee_[5.8]? Error in band [5.8]magstat.errordoublenullable[8.0]Spitzer flux in magnitude for band [8.0], in 3.6 aperturemagphot.flux.density;em.IR.8-15umdoublee_[8.0]Error in band [8.0]magstat.errordoubleDisc[0/1] Disc presence (disc=1 and no disc=0)meta.codeintRefReference (1)meta.ref;pos.frameintSpitzerSpitzer identificationmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/MNRAS/524/1826/colourColour excess values for 124 sources (table F3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIdInternal identification numbermeta.id;meta.mainfloatRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainVtype[1/4]? Variability type (G1)meta.noteintnullableP? Perioddtime.periodfloatnullablePowerPeak power of periodogrammeta.noteintVhs[0/1] High-scatter variables (1=yes, 0=no)meta.codeintSpTypeSpectral Type: M1 to M9, "nonM" for earlier spectral types and "N" for unidentified spectrasrc.spTypecharZamsFlag[0/1] Object above zams in i-y colour (1=yes, 0=no)meta.codeintGaiaFlag[0/1] Gaia candidate according us parameters (1=yes, 0=no)meta.codeintGaia? Gaia source identificationmeta.idnullableSpitzerSpitzer source identificationmeta.idcharPS1Pan-STARRS source identificationmeta.idE(g-r)? Colour excess in E(g-r)magphot.color.excessdoublenullablee_E(g-r)? Error in E(g-r)magstat.errordoublenullableE(r-i)? Colour excess in E(r-i)magphot.color.excessdoublenullablee_E(r-i)? Error in E(r-i)magstat.errordoublenullableE(z-y)Colour excess in E(z-y)magphot.color.excessfloate_E(z-y)Error in E(z-y)magstat.errorfloatE(r-z)? Colour excess in E(r-z)magphot.color.excessdoublenullablee_E(r-z)? Error in E(r-z)magstat.errordoublenullableE(i-z)Colour excess in E(i-z)magphot.color.excessfloate_E(i-z)Error in E(i-z)magstat.errorfloatE(i-y)Colour excess in E(i-y)magphot.color.excessfloate_E(i-y)Error in E(i-y)magstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharHalphaHalpha spectral line in emission (Ha), in absorption (Ha-) and "HaCa" is H{alpha} and CaII emission line presencemeta.codecharDisc[0/1]? Excess in IR or H{alpha} (1=excess, 0=no excess)meta.codeintnullableJ/MNRAS/524/1826/memcandObjects with spectral type but not fulfilling the membership criteria (table F4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIdInternal identification numbermeta.id;meta.mainfloatRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainImagPhotometric instrumental I-bandmagphot.mag;em.opt.Ifloate_ImagInstrumental rms I-bandmagstat.error;phot.magdoubledImagDifferential magnitudemagphot.mag;arith.diffdoubleVtype[1/4]? Variability type (G1)meta.noteintnullableP? Perioddtime.periodfloatnullablePowerPeak power of periodogrammeta.notefloatVhs[0/1] High-scatter variables (1=yes, 0=no)meta.codeintHalphaH{alpha} spectral line in emission (Ha), in absorption (Ha-) and "HaCa" is H{alpha} and CaII emission line presencemeta.codecharSpTypeSpectral Type: M1 to M9, "nonM" for earlier spectral types and "N" for unidentified spectrasrc.spTypecharDisc[0/9]? Excess in IR or H{alpha} (1=excess, 0=no excess, 9=NaN)meta.codeintnullableZamsFlag[0/1]? Object above zams in i-y colour (1=yes, 0=no)meta.codeintnullableGaiaFlag[0/1]? Gaia candidate according us parameters (1=yes, 0=no)meta.codeintnullableGaia? Gaia source identificationmeta.idnullableSpitzerSpitzer source identificationmeta.idcharPS1? Pan-STARRS source identificationmeta.idnullableJ/MNRAS/524/1826/bdcandBD candidates (table F6)PowerPeak power of periodogrammeta.noteintVhs[0/1] High-scatter variables (1=yes, 0=no)meta.codeintHalpha[-] H{alpha} spectral line in emission (Ha), in absorption (Ha-) and "HaCa" is H{alpha} and CaII emission line presencemeta.codecharSpType[-] Spectral Type: M1 to M9, "nonM" for earlier spectral types and "N" for unidentified spectrasrc.spTypecharDisc[0/1]? Excess in IR or H{alpha} (1=excess, 0=no excess)meta.codefloatnullableZamsFlag[0/1] Object above zams in i-y colour (1=yes, 0=no)meta.codeintGaiaFlag[0/1] Gaia candidate according us parameters (1=yes, 0=no)meta.codeintGaia? Gaia source identificationmeta.idnullableSpitzerSpitzer source identification (JHHMMSS.ss+DDMMSS.s)meta.idcharPS1? Pan-STARRS source identificationmeta.idnullableP? Perioddtime.periodfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIdInternal identification numbermeta.id;meta.mainfloatRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainVtype[1/4]? Variability type (G1)meta.noteintnullableJ/MNRAS/524/1826/listlcList of light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLCShow the light curvemeta.ref.urlcharIdInternal identification numbermeta.id;meta.mainfloatRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainImagAverage magnitude in I-bandmagphot.mag;em.opt.Ifloate_ImagStandard deviation of the average magnitude of the I-bandmagstat.error;phot.magdoubledImagAverage I-band differential magnitudemagphot.mag;arith.diffdoublee_dImagStandard deviation of the average differential magnitude of I-bandmagstat.error;phot.magdoublepowerpower of the periodogrammeta.notedoubleVType[0/4] Type of variability (G1)meta.noteintPerPeriod (reliable for powers greater than 70)dtime.perioddoubleFileNameName fo the file with light curve data in subdirectory lcmeta.id;meta.filechar