ASP Monograph
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Paper: The λ Orionis Star Forming Region
Volume: 4, Handbook of Star Forming Regions:
Volume I, The Northern Sky
Page: 757
Authors: Mathieu, R.D.
Abstract: Around the O8 star λ Orionis is a highly evolved star-forming region, comprising recently formed stars from 0.2 M to 24 Mand dark clouds actively forming stars, all within a 30-pc radius ring of dust and neutral and molecular hydrogen. The spatial and age distributions of the stars show that originally star formation occurred in an elongated giant molecular cloud, with the most massive stars forming in a dense central core. A supernova is suggested as the mechanism that terminated star formation in that core and formed the surrounding ring. Star formation continues in remnant dark clouds distant from the original core. The local initial mass functions differ significantly across the region, although the global IMF is field-like. Interestingly, the lack of Hα emission in stars near λ Ori indicates that the environment of the massive stars was not conducive for the survival of accretion disks.
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