========================================================================== J/AJ/126/1665 NICMOS observations of NGC 2024 (Liu+, 2003) The following files can be converted to FITS (extension .fit .fgz or .fiZ) table1.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/AJ/126/1665 ==========================================================================
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Beginning of ReadMe : J/AJ/126/1665 NICMOS observations of NGC 2024 (Liu+, 2003) ================================================================================ Hubble Space Telescope NICMOS observations of the embedded cluster in NGC 2024: constraints on the initial mass function and binary fraction . Liu W.M., Meyer M.R., Cotera A.S., Young E.T. <Astron. J. 126, 1665 (2003)> =2003AJ....126.1665L ================================================================================ ADC_Keywords: Clusters, open ; Photometry ; Stars, double and multiple Keywords: binaries: visual - open clusters and associations: individual (NGC 2024) - stars: formation - stars: luminosity function, mass function - stars: pre-main-sequence Abstract: We present an analysis of NICMOS observations of the embedded cluster associated with NGC 2024. An analysis of the cluster color-magnitude diagram (CMD) using the models of D'Antona & Mazzitelli and Baraffe et al. (published in 1997MmSAI..68..807D and 1998, Cat. J/A+A/337/403, respectively) indicates that the ratio of intermediate-mass (1.0-10.0M_sun_) to low-mass (0.1-1.0M_sun_) stars is consistent with the stellar initial mass function (IMF) for the field. In addition to the CMD analysis, we present results on the multiplicity of stars in the region. Three companions (in a sample of 95 potential primaries) were found, with angular separations between 0.4" and 1.0", translating to a projected linear separation of 184-460AU for an estimated distance of 460pc. The completeness of binary detections is assessed using recovery fractions calculated by a series of tests using artificially generated companions to potential primaries in the data frames. We find that the binary fraction in NGC 2024 is consistent with that of Duquennoy & Mayor (published in 1991A&A...248..485D) for solar neighborhood stars over the range of separations and companion masses appropriate for our survey. Description: Images of the young embedded cluster associated with NGC 2024 were obtained on 1998 January 17 using camera 3 of NICMOS (NIC3) on HST.