{"paper":{"title":"The M4 Core Project with HST --- I. Overview and First-Epoch","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"1), (10) Univ. of Amsterdam, 11), (11) Harvard-Smithsonian CfA, (12) Sam Houston State Univ., 13), (13) Eureka Scientific, (14) Aarhus Univ., 15), (15) Univ. of Victoria), (2) STScI, (3) Univ. of Edinburg, (4) Univ. of Padova, (5) IAC, 6, (6) Univ. of La Laguna, 7), (7) RSAA-ANU, (8) N. Copernicus AC Warsaw, (9) UCLA, A. Bellini (2), A. F. Marino (7). ((1) INAF-OAPD, A. P. Milone (5, D. C. Heggie (3), D. Pooley (12, G. Piotto (4, Inc., K. Brogaard (14, L. Malavolta (4, L. R. Bedin (1) J. Anderson (2), L. Ubeda (2), M. Giersz (8), M. van den Berg (10, R. M. Rich (9), S. Ortolani (4, V. Nascimbeni (4","submitted_at":"2013-12-04T10:19:18Z","abstract_excerpt":"We present an overview of the ongoing Hubble Space Telescope large program GO-12911. The program is focused on the core of M4, the nearest Galactic globular cluster, and the observations are designed to constrain the number of binaries with massive companions (black holes, neutron stars, or white dwarfs) by measuring the ``wobble'' of the luminous (main-sequence) companion around the center of mass of the pair, with an astrometric precision of ~50 micro-arcseconds. The high spatial resolution and stable medium-band PSFs of WFC3/UVIS will make these measurements possible. In this work we descri"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1312.1096","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"}