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Paper: The Dispersed Young Population in Orion
Volume: 4, Handbook of Star Forming Regions:
Volume I, The Northern Sky
Page: 838
Authors: Briceño, C.
Abstract: The Orion OB1 Association, at a distance of roughly 400 pc and spanning over 200 deg2 on the sky, is one of the largest and nearest OB associations. With a wide range of ages and environmental conditions, Orion is an ideal laboratory for investigating fundamental questions related to the birth of stars and planetary systems. This rich region exhibits all stages of the star formation process, from very young, embedded clusters, to older, fully exposed young stars; it also harbors dense clusters and widely spread populations in vast, low stellar density areas. This review focuses on the later, namely, the low-mass (M* ≤ 2M), pre-main sequence population spread over wide spatial scales in Orion OB1, mostly in the off-cloud areas. As ongoing studies yield more complete censa it becomes clearer that this ”distributed” or non-clustered population, is as numerous as that located in the molecular clouds; modern studies of star formation in Orion would be incomplete if they did not include this widely spread population.
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