TY - JOUR AU - Caballero, J. A. AU - Valdivielso, L. AU - Martín, E. L. AU - Montes Gutiérrez, David AU - Pascual Ramírez, Sergio AU - Pérez González, Pablo Guillermo PY - 2008 DO - 10.1051/0004-6361:200810616 SN - 0004-6361 UR - https://hdl.handle.net/20.500.14352/51879 T2 - Astronomy & Astrophysics AB - Aims. We study in detail nine sources in the direction of the young σ Orionis cluster, which is considered to be a unique site for studying stellar and substellar formation. The nine sources were selected because of their peculiar properties, such as... LA - eng M2 - 515 PB - EDP Sciencies KW - Low-mass stars KW - Alpha emission stars KW - XMM-Newton observations KW - Young brown dwarfs KW - T-Tauri stars KW - H-alpha KW - Main-sequence KW - Ori cluster KW - Optical spectroscopy KW - Candidate members TI - Low-resolution spectroscopy and spectral energy distributions of selected sources towards σ Orionis TY - journal article VL - 491 ER -