{"paper":{"title":"Star formation history of CMa R1: I. Wide-field X-ray study of the young stellar population","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"(2) Laboratoire d'Astrophysique de Grenoble, (3) Instituto Nacional de Pesquisas Espaciais, (4) Universit\\\"ats-Sternwarte M\\\"unchen, (5) Astrophysikaliches Institut Potsdam.), Brazil, C. V. Rodrigues (3), Departamento de Astronomia, Divis\\~ao de Astrof\\'isica, E. Marciotto (1), France, Germany, H. Zinnecker (5) ((1) Universidade de S\\~ao Paulo, IAG, J. Gregorio-Hetem (1), S\\~ao Jos\\'e dos Campos, SP, T. Montmerle (2), T. Preibisch (4), Universit\\'e Joseph Fourier-CNRS","submitted_at":"2009-09-15T21:50:05Z","abstract_excerpt":"The CMa R1 star-forming region contains several compact clusters as well as many young early-B stars. It is associated with a well-known bright rimmed nebula, the nature of which is unclear (fossil HII region or supernova remnant). To help elucidate the nature of the nebula, our goal was to reconstruct the star-formation history of the CMa R1 region, including the previously unknown older, fainter low-mass stellar population, using X-rays. We analyzed images obtained with the ROSAT satellite, covering ~5 sq. deg. Complementary VRI photometry was performed with the Gemini South telescope. Colou"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2888","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}