Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..324p&link_type=abstract
Publications of the Astronomical Society of the Pacific, v.105, p.324
Astronomy and Astrophysics
Astronomy
12
Scientific paper
We present the results of a large scale near-infrared (J, H, K) survey of the star forming region NGC 2264. The survey covers 48' (Dec) X 27' (RA) with a completness limit of 15.5, 14.5, and 14 magnitudes at J, H, and K respectively. Complementary observations of NGC 2023, NGC 2068 and NGC 7023 are also discussed. Young stars in NGC 2264 are concentrated in two clusters. The northern cluster is highlighted by the bright star S Mon. The infrared source NGC 2264 IRS, the molecular outflow NGC 2264D and the Cone Nebula are associated with the southern cluster. The northern cluster is divided into two subclusters, the southern cluster has three subclusters. The luminosity functions (LFs) of NGC 2264 subclusters have slopes in the range 0.28 - 0.30. This is also the case for NGC 2068. NGC 2023's LF is shallower (0.21). There is a break in the LF of NGC 7023 around K=10.5 magnitudes. All LFs are consistent with a Salpeter IMF and a Miller-Scalo IMF. For NGC 7023, we obtain a better agreement with a Miller-Scalo IMF. The differences in LF can be attributed to cluster ages. NGC 2023 is approxiamtely one million years old. NGC 7023 is old enough for its LF to be consistent with a cluster of main sequence stars. The NGC 2264 clusters and NGC 2068 have ages intermediate between NGC 2023 and NGC 7023. A large fraction of LFs have turn-offs at their faint end. These can be interpreted as turn-offs at the low mass end of the corresponding initial mass function. We present a new optical-infrared color-color diagram (V-J vs J-K) that is more efficient at detecting stars with infrared excesses than the infrared color-color diagram (V-H vs H-K). The luminosity function of infrared excess stars in NGC 2264 peaks around K=11 magnitudes. Finally, we report the detection of a pedestal stellar population in NGC 2264. Dissipation of the main clusters could explain the properties of this stellar population. (SECTION: Dissertation Abstracts)
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