The Origin of the Lambda Orionis Star Forming Region

The aim of this proposal is to verify whether the Lambda Orionis Star Formingregion (LOSFR), composed by several dark clouds in a 10 deg diameter ring, wascreated by a SN explosion coming from the central cluster, or by cloudfragmentation. So far, we have carried out a multiwavelength study of theproperties of three clusters within the region, Coll69 (in the center) and B30 &B35 (in the rim), finding clear evidences of age spread between them. We proposeto image two regions between C69 and B30 to study the radial distribution ofyoung stellar sources from the center to the rim. While a continuous number ofsources would be consistent with a supernova explosion, a clear discontinuitywould point towards cloud fragmentation as the most probable formation scenario. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]