In this fifth paper of a series on high-mass star formation, we continue our study with the bipolar nebula NS 14. We have imaged this nebula at J (1.23 μm), H (1.65 μm), and K (2.23 μm) broadband near-infrared (NIR) wavelengths. We have also obtained 3.29 μm dust feature emission and Brγ (n = 7 → 4, 2.166 μm) hydrogen recombination line emission images of this region. The broadband reflection nebulosity, surrounding a central "Trapezium" of stars, forms a bipolar structure that is also seen in the 3.29 μm dust feature emission. This dust feature emission exhibits limb brightening; therefore, small dust grains in the central regions of the bipolar structure have been evacuated. The Brγ line emission consists of a compact component ≤2'' in size and a more extended component ~5'' × 7'' or larger in size. A study of the stellar population of the cluster, centered on the nebular emission, has also been made.
Authors: Eric Howard, J. L. Pipher, W. J. Forrest
DOI: https://doi.org/10.1086/306519
Publish Year: 1998
