{"paper":{"title":"The first determination of the viscosity parameter in the circumstellar disk of a Be Star","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Alex C. Carciofi, Atsuo T. Okazaki, Dietrich Baade, Jon E. Bjorkman, Sebasti\\'an A. Otero, Stanislav \\v{S}tefl, Thomas Rivinius, Xavier Haubois","submitted_at":"2011-11-30T23:20:00Z","abstract_excerpt":"Be stars possess gaseous circumstellar decretion disks, which are well described using standard $\\alpha$-disk theory. The Be star 28 CMa recently underwent a long outburst followed by a long period of quiescence, during which the disk dissipated. Here we present the first time-dependent models of the dissipation of a viscous decretion disk. By modeling the rate of decline of the V-band excess, we determine that the viscosity parameter $\\alpha=1.0\\pm0.2$, corresponding to a mass injection rate $\\dot{M}=(3.5\\pm 1.3) \\times 10^{-8}\\ M_\\sun\\,\\mathrm{yr}^{-1}$. Such a large value of $\\alpha$ sugges"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1112.0053","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"}