{"paper":{"title":"A 421 d Activity Cycle in the BeX Recurrent Transient A0538-66 from MACHO monitoring","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. B. Tomaney, A. C. Becker, A. J. Drake, B. A. Peterson, C. Alcock, C. A. Nelson, C. W. Stubbs, D. L. Welch, D. Minniti, D. P. Bennett, D. R. Alves, K. C. Freeman, K. E. McGowan, K. Griest, K. H. Cook, M. Geha, M. J. Lehner, M. R. Pratt, P. A. Charles, P. J. Quinn, P. Popowski, R. A. Allsman, S. L. Marshall, T. S. Axelrod, T. Vandehei, W. Sutherland","submitted_at":"2000-09-26T14:03:38Z","abstract_excerpt":"We present a ~ 5-yr optical light curve of the recurrent Be/X-ray transient A0538-66 obtained as a by-product of the MACHO Project. These data reveal both a long-term modulation at P = 420.8 +/- 0.8 d and a short-term modulation at 16.6510 +/- 0.0022 d which, within errors, confirms the previously found orbital period. Furthermore, the orbital activity is only seen at certain phases of the 421 d cycle suggesting that the long-term modulation is related to variations in the Be star envelope."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0009415","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0009415/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}