J/AJ/115/592ivo://CDS.VizieR/J/AJ/115/592doi:10.26093/cds/vizier.51150592CDSFischer P.Pryor C.Murray S.Mateo M.Richtler T.2023-04-06T16:50:28Z1999-06-19T20:56:17ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsopen-star-clustersinfrared-photometryvisible-astronomyphotometryWe have carried out Wide Field Planetary Camera 2 V- and I-band imaging of the young LMC cluster NGC 2157. Construction of a color-magnitude diagram and isochrone fitting yield an age of {tau}=10^8^yr, a reddening E(B-V)=0.1, and a distance modulus of 18.4mag. Our data cover the mass range 0.75M_{sun}_<=m<=5.1M_{sun}_. We find that the cluster mass function changes significantly from the inner regions to the outer regions, becoming steeper (larger number of low-mass stars relative to high-mass stars) at larger radii. The age of NGC 2157 is comparable to its two-body relaxation timescale only in the cluster core. The observed steepening of the mass function at larger radii is therefore most likely an initial condition of the cluster stars. Such initial conditions are predicted in models of cluster star formation in which dissipative processes act more strongly upon more massive stars.1998AJ....115..592Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/115/592CatalogResearchIsServedByTAP VizieR generic servicerelated-toVII/183 : Cluster System of the LMC (Kontizas+ 1990)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/115/592https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/115/592http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/115/592https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/115/592https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/115/592http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/115/592GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapHSTOpticalInfrareddefaultJ/AJ/115/592/table1Cluster Planerary Camera (PC) photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.id;meta.mainintxposx position (1)pixpos.cartesian.x;instr.detfloatyposy position (1)pixpos.cartesian.y;instr.detfloatV0Dereddenned V magnitude (2)magphot.mag;em.opt.Vfloate_V0rms uncertainty on V0magstat.errorfloat(V-I)0Dereddenned V-I index (2)magphot.color;em.opt.V;em.opt.Ifloate_(V-I)0rms uncertainty on (V-I)0magstat.errorfloatJ/AJ/115/592/table2Cluster Wide Field Planerary Camera 2 (WF2) photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.id;meta.mainintxposx position (1)pixpos.cartesian.x;instr.detfloatyposy position (1)pixpos.cartesian.y;instr.detfloatV0Dereddenned V magnitude (2)magphot.mag;em.opt.Vfloate_V0rms uncertainty on V0magstat.errorfloat(V-I)0Dereddenned V-I index (2)magphot.color;em.opt.V;em.opt.Ifloate_(V-I)0rms uncertainty on (V-I)0magstat.errorfloatJ/AJ/115/592/table3Cluster WF3 photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.id;meta.mainintxposx position (1)pixpos.cartesian.x;instr.detfloatyposy position (1)pixpos.cartesian.y;instr.detfloatV0Dereddenned V magnitude (2)magphot.mag;em.opt.Vfloate_V0rms uncertainty on V0magstat.errorfloat(V-I)0Dereddenned V-I index (2)magphot.color;em.opt.V;em.opt.Ifloate_(V-I)0rms uncertainty on (V-I)0magstat.errorfloatJ/AJ/115/592/table4Cluster WF4 photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.id;meta.mainintxposx position (1)pixpos.cartesian.x;instr.detfloatyposy position (1)pixpos.cartesian.y;instr.detfloatV0Dereddenned V magnitude (2)magphot.mag;em.opt.Vfloate_V0rms uncertainty on V0magstat.errorfloat(V-I)0Dereddenned V-I index (2)magphot.color;em.opt.V;em.opt.Ifloate_(V-I)0rms uncertainty on (V-I)0magstat.errorfloatJ/AJ/115/592/table5Background PC photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.id;meta.mainintxposx position (1)pixpos.cartesian.x;instr.detfloatyposy position (1)pixpos.cartesian.y;instr.detfloatV0Dereddenned V magnitude (2)magphot.mag;em.opt.Vfloate_V0rms uncertainty on V0magstat.errorfloat(V-I)0Dereddenned V-I index (2)magphot.color;em.opt.V;em.opt.Ifloate_(V-I)0rms uncertainty on (V-I)0magstat.errorfloatJ/AJ/115/592/table6Background WF2 photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.id;meta.mainintxposx position (1)pixpos.cartesian.x;instr.detfloatyposy position (1)pixpos.cartesian.y;instr.detfloatV0Dereddenned V magnitude (2)magphot.mag;em.opt.Vfloate_V0rms uncertainty on V0magstat.errorfloat(V-I)0Dereddenned V-I index (2)magphot.color;em.opt.V;em.opt.Ifloate_(V-I)0rms uncertainty on (V-I)0magstat.errorfloatJ/AJ/115/592/table7Background WF3 photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.id;meta.mainintxposx position (1)pixpos.cartesian.x;instr.detfloatyposy position (1)pixpos.cartesian.y;instr.detfloatV0Dereddenned V magnitude (2)magphot.mag;em.opt.Vfloate_V0rms uncertainty on V0magstat.errorfloat(V-I)0Dereddenned V-I index (2)magphot.color;em.opt.V;em.opt.Ifloate_(V-I)0rms uncertainty on (V-I)0magstat.errorfloatJ/AJ/115/592/table8Background WF4 photometrySeqSequential numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintxposx position (1)pixpos.cartesian.x;instr.detfloatyposy position (1)pixpos.cartesian.y;instr.detfloatV0Dereddenned V magnitude (2)magphot.mag;em.opt.Vfloate_V0rms uncertainty on V0magstat.errorfloat(V-I)0Dereddenned V-I index (2)magphot.color;em.opt.V;em.opt.Ifloate_(V-I)0rms uncertainty on (V-I)0magstat.errorfloat