{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:C3XQAUQIQPV7N3RGAHDRGA2JIA","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"f2f7901bcb54634230a878dd6c9ff2536a9abf570a625ad0f9840eb5ed5f6b57","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1998-05-29T12:38:45Z","title_canon_sha256":"ed2248e2b9cddfd3e633b30f2d82beea62081214d5f6da05b337384ab67b06be"},"schema_version":"1.0","source":{"id":"astro-ph/9805364","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9805364","created_at":"2026-05-18T04:21:40Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9805364v1","created_at":"2026-05-18T04:21:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9805364","created_at":"2026-05-18T04:21:40Z"},{"alias_kind":"pith_short_12","alias_value":"C3XQAUQIQPV7","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"C3XQAUQIQPV7N3RG","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"C3XQAUQI","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:28429c2829ae2ba0fe9848155df0ea85dd293533f2c02ff95afee9d91f95d50a","target":"graph","created_at":"2026-05-18T04:21:40Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We present optical identification and high-resolution spectroscopy of ROSAT sources in the field of the old open cluster M 67. For the first time it is possible to analyze coronal and chromospheric activity of active stars in a solar-age cluster, and to compare it with field stars. ROSAT observed the high X-ray luminosity tail of the cluster sources. In agreement with what expected from studies of field stars, most of the detected X-ray sources are binaries, preferably with short periods and eccentric orbits. In addition, several of the M 67 ROSAT sources have peculiar locations in the cluster","authors_text":"Garching), L. Pasquini (ESO, T. Belloni (University of Amsterdam)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1998-05-29T12:38:45Z","title":"Optical Identification of ROSAT sources in M 67: activity in an old cluster"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9805364","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:7d1738a29edac47fa70cc5d2030715a49b0bb92377b83d3857403078a5b90e57","target":"record","created_at":"2026-05-18T04:21:40Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"f2f7901bcb54634230a878dd6c9ff2536a9abf570a625ad0f9840eb5ed5f6b57","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1998-05-29T12:38:45Z","title_canon_sha256":"ed2248e2b9cddfd3e633b30f2d82beea62081214d5f6da05b337384ab67b06be"},"schema_version":"1.0","source":{"id":"astro-ph/9805364","kind":"arxiv","version":1}},"canonical_sha256":"16ef00520883ebf6ee2601c7130349402e33324dcf2b3e128275c210828ff597","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"16ef00520883ebf6ee2601c7130349402e33324dcf2b3e128275c210828ff597","first_computed_at":"2026-05-18T04:21:40.185424Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:21:40.185424Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3duQFc75k2eKm27NEGYkcBMMi3t8KyPtWC11DekhZsXD7EBjtqVLTr2mYp/sdPDMPQ4X2OWxAbmEona5tcJNBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:21:40.186071Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9805364","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7d1738a29edac47fa70cc5d2030715a49b0bb92377b83d3857403078a5b90e57","sha256:28429c2829ae2ba0fe9848155df0ea85dd293533f2c02ff95afee9d91f95d50a"],"state_sha256":"a88a730e872121a5cdd877e50bb87443db5cefa7281098edc0e28a5210effbfd"}