J/MNRAS/443/454ivo://CDS.VizieR/J/MNRAS/443/454doi:10.26093/cds/vizier.74430454CDSLim B.Sung H.Kim J.S.Bessell M.S.Park B.-G.2026-03-18T15:45:46Z2015-07-09T08:42:27ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryvisible-astronomybroad-band-photometryh-alpha-photometryWe present a UBVI and H{alpha} photometric study of the young open cluster NGC 1893 in the HII region W8 (IC 410 or Sh 2-236). A total of 65 early-type members are selected from photometric diagrams. A mean reddening of the stars is <E(B-V)>=0.563+/-0.083mag. The published photometric data in the near- and mid-infrared passbands are used to test the reddening law towards the cluster, and we confirm that the reddening law is normal (R_V_=3.1). Zero-age main-sequence fitting gives a distance modulus of V_0_-M_V_= 12.7+/-0.2mag, equivalent to 3.5+/-0.3kpc. From H{alpha} photometry, 125 H{alpha} emission stars and candidates are identified as pre-main-sequence (PMS). The lists of young stellar objects and X-ray sources published by previous studies allow us to select a large number of PMS members down to 1M_{sun}_. Isochrone fitting in the Hertzsprung-Russell diagram gives a turn-off age of 1.5Myr and the median age of 1.9Myr from the PMS members with a spread of ~5Myr. We derive the initial mass function (IMF) for stars with mass larger than 1M_{sun}_. The slope of the IMF ({Gamma}=-1.3+/-0.1) is well consistent with the Salpeter/Kroupa IMF. A total mass of the cluster appears to be in excess of 1300M_{sun}_. Finally, we estimate the mass accretion rate of 82 PMS members in the mass range of 0.6-5M_{sun}_.2014MNRAS.443..454Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/443/454CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/438/1451 : UBVIHa photometry of IC 1848 (Lim+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/443/454https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/443/454http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/443/454https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/443/454https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/443/454http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/443/454GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/443/454/table2 (Photometric data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/443/454/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/443/454/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/443/454/table2?GETtext/xml+votable180.050000true80.511958333.469750.0055555555555555566/1285 1287 1296 1298https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/443/454?format=asciiOpticalInfrareddefaultJ/MNRAS/443/454/table2Photometric datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[-18/6485] Sequential number (1)meta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmag[9/23.2]? Bessel V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.magfloatnullableo_Vmag[0/2] Number of observations for Vmagmeta.numberintImag[10.3/21.3]? Bessel I magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? rms uncertainty on Imagmagstat.error;phot.magfloatnullableo_Imag[0/2] Number of observations for Imagmeta.numberintV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-I? rms uncertainty on V-Imagstat.error;phot.color;em.opt.Vfloatnullableo_V-I[0/2] Number of observations for V-Imeta.numberintB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-Vmagstat.error;phot.color;em.opt.Bfloatnullableo_B-V[0/2] Number of observations for B-Vmeta.numberintU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? rms uncertainty on U-Bmagstat.error;phot.color;em.opt.Ufloatnullableo_U-B[0/2] Number of observations for U-Bmeta.numberintH-C? H{alpha} index (C=(V+I)/2)magphot.color;em.opt.V;em.line.Halphafloatnullablee_H-C? rms uncertainty on H-Cmagstat.errorfloatnullableo_H-C[0/2] Number of observations for H-Cmeta.numberint2MASS2MASS name (HHMMSSss+DDMMSSs)meta.idcharem[Hh] H{alpha} emission flag (2)meta.notecharSpTypeSpectral type for stars -1 to -18 (3)src.spTypechar