Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...473..294c&link_type=abstract
Astrophysical Journal v.473, p.294
Astronomy and Astrophysics
Astronomy
53
Ism: H Ii Regions, Galaxy: Open Clusters And Associations: Individual Ngc Number: Ngc 2024, Ism: Individual Ngc Number: Ngc 2024, Stars: Low-Mass, Brown Dwarfs, Stars: Luminosity Function, Mass Function
Scientific paper
We have obtained deep JHK imaging of the central region of the NGC 2024 embedded cluster, allowing three-color measurements of t5t sources. We show that contamination by background sources is small, and we reject a small number of sources that are probably foreground. We use a Monte Carlo isochrone fitting technique to estimate the luminosities and masses of the low-mass members of the embedded cluster. We find that the IMF between ˜0.04 and ˜0.5 Msun can be fitted within the errors with a power law of slope -1.2 in linear mass units (or -0.2 in logarithmic units). There is no indication of a turnover of the IMF at the bottom of the main sequence; it appears to continue down to ˜0.04 Msun with no significant deviation (within our moderately large errors) from the power law. This estimate of the IMF includes only the primary members of binary (or multiple) systems. Of a subset of 35 sources, 24 (69%) appear to have infrared excesses indicating possible circumstellar disks, supporting arguments that disk formation is not inhibited in high-density clusters.
Comeron Fernando
Rieke George H.
Rieke Marcia J.
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