{"paper":{"title":"Toward Understanding The B[e] Phenomenon: V. Nature and Spectral Variations of the MWC 728 Binary System","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A.S. Miroshnichenko, A.V. Kusakin, Ch.T. Omarov, D. Kor\\v{c}\\'akov\\'a, K.N. Grankin, K.S. Kuratov, M. \\v{S}lechta, N. Manset, R. K\\v{r}\\'i\\v{c}ek, S. Danford, S.V. Zharikov","submitted_at":"2015-08-05T01:35:41Z","abstract_excerpt":"We report the results of a long-term spectroscopic monitoring of the FS\\,CMa type object MWC\\,728. We found that it is a binary system with a B5 Ve (T$_{\\rm eff}$ = 14000$\\pm$1000 K) primary and a G8 III type (T$_{\\rm eff} \\sim$ 5000 K) secondary. Absorption line positions of the secondary vary with a semi-amplitude of $\\sim$20 km/s and a period of 27.5 days. The system's mass function is 2.3$\\times10^{-2}$ M$_\\odot$, and its orbital plane is $13^{\\circ}-15^{\\circ}$ tilted from the plane of the sky. The primary's $v \\sin i \\sim$110 km/s combined with this tilt implies that it rotates at a near"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.00950","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"}