J/AJ/114/198ivo://CDS.VizieR/J/AJ/114/198doi:10.26093/cds/vizier.51140198CDSCarpenter J.M.Meyer M.R.Dougados C.Strom S.E.Hillenbrand L.A.2023-04-06T16:50:26Z1998-06-03T16:24:45ZCDS support team

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

cds-question@unistra.frstellar-associationsinfrared-photometryWe present an extensive study of the stellar population of an embedded cluster in the MonR2 molecular cloud based upon a wide field (~15'x15') J, H, and K band mosaic, deep near-infrared imaging at J, H, K, and nbL' bands of the central cluster region, and spectroscopic observations of 34 stars. By comparing the properties of the MonR2 cluster with other star forming regions, we ultimately hope to learn how the properties and formation of stars of various masses are related to the local physical conditions. The K band star counts indicate that the MonR2 cluster extends over a ~1.1pcx2.1pc area with a FWHM cluster size of ~0.38pc. Within this region the cluster contains ~309 stars brighter than m_K=14.5m and >~475 stars over all magnitudes with a central stellar volume density of ~9000 stars pc^-3^. We have further explored the properties of the cluster by using the spectroscopic and photometric data to construct an extinction-limited sample of 115 stars in the central 0.77pcx0.77pc region of the cluster that is designed to contain all stars with A_V<=11.3m and stellar masses >=0.1M_{sun}_. As a lower limit, 62% of the stars in this sample contain a near-infrared excess at K and/or L band. The K band excess fraction may be as high as 72% if the accretion characteristics of the stars in the MonR2 cluster are similar to stars in Taurus-Auriga. An initial reconnaissance of the stellar mass function suggests that the ratio of high to low mass stars in the extinction-limited sample is consistent with the value expected for a Miller-Scalo IMF. We do not find compelling evidence for mass segregation in the extinction-limited sample for stellar masses <~2M_{sun}_, although the most massive star (~10M_{sun}_) in the cluster appears to be forming near the cluster center. The properties of the MonR2 cluster are similar to other rich young clusters in the solar neighborhood, such as NGC 2024 and the Trapezium. (c) 1997 American Astronomical Society.1997AJ....114..198Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/114/198CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/114/198https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/114/198http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/114/198https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/114/198https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/114/198http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/114/198GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/114/198/table1 (SQIID photometry of MonR2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/114/198/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/114/198/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/114/198/table1?GETtext/xml+votable180.050000true91.8301324-6.34731810.005555555555555556Cone search capability for table J/AJ/114/198/table2 (IRCAM3 photometry of MonR2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/114/198/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/114/198/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/114/198/table2?GETtext/xml+votable180.050000true91.9188935-6.37941630.0055555555555555566/21447 214584.925240337479573e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/114/198?format=asciiInfrareddefaultJ/AJ/114/198/table1SQIID photometry of MonR2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[CMD97]Identification numbermeta.id;meta.mainintRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainJmag? J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? 1-sigma uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? 1-sigma uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? K band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? 1-sigma uncertainty in Kmagmagstat.error;phot.mag;em.IR.KfloatnullablenbL'? nbL' band magnitude (table2.dat only)magphot.mag;em.IR.3-4umfloatnullablee_nbL'? 1-sigma uncertainty in nbL'magstat.errorfloatnullableNotesAdditional notes (table2.dat only)meta.notechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/AJ/114/198/table2IRCAM3 photometry of MonR2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[CMD97]Identification numbermeta.id;meta.mainintRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainJmag? J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? 1-sigma uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? 1-sigma uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? K band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? 1-sigma uncertainty in Kmagmagstat.error;phot.mag;em.IR.KfloatnullablenbL'? nbL' band magnitude (table2.dat only)magphot.mag;em.IR.3-4umfloatnullablee_nbL'? 1-sigma uncertainty in nbL'magstat.errorfloatnullableNotesAdditional notes (table2.dat only)meta.notechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed