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A K-band image, near-infrared photometry, and I-band polarization data on the bipolar H II region S106 are presented. When a distance of 600 pc is assumed, S106 is found to be associated with an 0.3-pc radius protocluster of about 160 stars embedded in the molecular cloud surrounding S106. Only a few of the stars in the present cluster show reflection nebulosity surrounding them, which is interpreted as a sign of very young age. An age estimate of 1 x 10 to the 6th - 2 x 10 to the 6th yr is derived for the cluster. The K-band brightness function in this cluster rises smoothly to the completeness limit of 14.0 mag. Only within the last 100,000 yr has a star formed that is sufficiently massive to remove significant amounts of gas from the protocluster and end further star formation there. Polarization data on embedded and background stars near S106 confirm earlier results about the magnetic field orientation in its parent molecular cloud.
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Hodapp et al. (1991) studied this question.
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