{"paper":{"title":"A Hubble Space Telescope Study of the Enigmatic Milky Way Halo Globular Cluster Crater","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alison Sills, Andrew E. Dolphin, Daniel R. Weisz, Edward W. Olszewski, Mario L. Mateo, Mark Gieles, Matthew G. Walker, Sergey E. Koposov, Vasily Belokurov","submitted_at":"2015-10-29T01:14:46Z","abstract_excerpt":"We analyze the resolved stellar populations of the faint stellar system, Crater, based on deep optical imaging taken with the Hubble Space Telescope. The HST/ACS-based color-magnitude diagram (CMD) of Crater extends $\\sim$4 magnitudes below the oldest main sequence turnoff, providing excellent leverage on Crater's physical properties. Structurally, Crater has a half-light radius of $\\sim$20 pc and shows no evidence for tidal distortions. Crater is well-described by a simple stellar population with an age of $\\sim$7.5 Gyr, [M/H]$\\sim-1.65$, a M$_{\\star}\\sim10^4$ M$_{\\odot}$, M$_{\\rm V}\\sim -5.3"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.08533","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"}