{"paper":{"title":"Does the Oosterhoff Dichotomy Exist in The Andromeda Galaxy? I. The case of G11","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"2, (2) Dipartimento di Astronomia, 3), (3) Pontificia Universidad Catolica de Chile, (4) Department of Physics, (5) INAF-Osservatorio Astronomico di Capodimonte, (6) Department of Physics, (7) Apache Point Observatory/New Mexico State University, 8), (8) The Milky Way Millennium Nucleus, Astronomy, Barton J. Pritzl (6), Carla Cacciari (1), Chile, Chile), Departamento de Astronomia y Astrofisica, Flavio Fusi Pecci (1), Gisella Clementini (1), Giuliana Fiorentino (1), Horace A. Smith (4), Italy, Karen Kinemuchi (7) ((1) INAF-Osservatorio Astronomico di Bologna, Luciana Federici (1), Marcella Marconi (5), Marcio Catelan (3, Michigan State University, Rodrigo Contreras Ramos (1, Santiago, Universita' di Bologna, University of Wisconsin Oshkosh, USA","submitted_at":"2013-01-17T14:08:45Z","abstract_excerpt":"We present the first evidence that Oosterhoff type II globular clusters exist in the Andromeda galaxy (M31). On the basis of time-series photometry of the moderately metal-poor ([Fe/H]\\sim -1.6 dex) M31 globular cluster G11, obtained with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope, we detected and derived periods for 14 RR Lyrae stars, of which five are found to lie inside the cluster tidal radius. They include three fundamental-mode (RRab) and two first-overtone (RRc) pulsators, with average periods <Pab> = 0.70 d, and <Pc> = 0.40 d, respectively. These mean periods"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1301.4100","kind":"arxiv","version":2},"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"}