Abstract
The masses of nine pre -main -sequence stars in NGC 2264 have been determined by employing flux measurements extending from 0.36 s -3.4 s in conjunction with model atmospheres. The resultant masses are in good agreement with theoretical predictions although there appears to be a systematic trend in that those stars located near the main sequence are more massive than expected from evolutionary calculations of nonrotating stars. In addition, a probable age spread of at least 2 X 106 years is shown to exist in NGC 2264.
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