{"paper":{"title":"Variability and star formation in Leo T, the lowest luminosity star-forming galaxy known today","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"2), (2) Dipartimento di Astronomia, (3) INAF, Gisella Clementini (1), Ilaria Musella (3) ((1) INAF, Italy, Italy), Luciana Federici (1), Marcella Marconi (3), Michele Cignoni (1, Monica Tosi (1), Napoli, Osservatorio Astronomico di Bologna, Osservatorio Astronomico di Capodimonte, Rodrigo Contreras Ramos (1, Universita' di Bologna, Vincenzo Ripepi (3)","submitted_at":"2012-07-11T20:00:00Z","abstract_excerpt":"We present results from the first combined study of variable stars and star formation history (SFH) of the Milky Way (MW) \"ultra-faint\" dwarf (UFD) galaxy Leo T, based on F606W and F814W multi-epoch archive observations obtained with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. We have detected 14 variable stars in the galaxy. They include one fundamental-mode RR Lyrae star and 10 Anomalous Cepheids with periods shorter than 1 day, thus suggesting the occurrence of multiple star formation episodes in this UFD, of which one about 10 Gyr ago produced the RR Lyrae star. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.2764","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"}