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W. M. Liu, M. R. Meyer, A. S. Cotera, E. T. Young (Steward Observatory, U. of Arizona)
We present an analysis of NICMOS observations of the embedded cluster NGC 2024. An analysis of the cluster color-magnitude diagram (CMD) using models of D'Antona & Mazzitelli (1998) and Baraffe et al. (1998) indicates that the ratio of intermediate mass (1.0 to 10.0 Msun) to low mass (0.1 to 1.0 Msun) stars is consistent with a field star IMF. We also present results on the multiplicity of stars in the region. Three companions (in a sample of 94 potential primaries) were found, with an angular separations between 0".4 and 1".0, translating to a projected linear separation of 184 AU to 460 AU for an estimated distance of 470 pc. 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 is similar to that of Duquennoy & Mayor (1991) for solar-type stars over the range of separations and companion masses appropriate for our survey.
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.