{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:WLGFT4EF4VP6XTAQ3EKCFQMAWT","short_pith_number":"pith:WLGFT4EF","canonical_record":{"source":{"id":"1811.09162","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-11-22T13:20:36Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"ced4bb7b563fbec355a184439a99a0b4572071f2cada9033875e01ec35eb9c7e","abstract_canon_sha256":"7485c15c8c3f9b4c1f6697792e4c7cfd7b4273c8a8f8e1fc62a5a3ca5fde8ea9"},"schema_version":"1.0"},"canonical_sha256":"b2cc59f085e55febcc10d91422c180b4e85f4ac6a2b89c52909aafbf5ad9373e","source":{"kind":"arxiv","id":"1811.09162","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.09162","created_at":"2026-05-17T23:53:24Z"},{"alias_kind":"arxiv_version","alias_value":"1811.09162v2","created_at":"2026-05-17T23:53:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.09162","created_at":"2026-05-17T23:53:24Z"},{"alias_kind":"pith_short_12","alias_value":"WLGFT4EF4VP6","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WLGFT4EF4VP6XTAQ","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WLGFT4EF","created_at":"2026-05-18T12:33:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:WLGFT4EF4VP6XTAQ3EKCFQMAWT","target":"record","payload":{"canonical_record":{"source":{"id":"1811.09162","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-11-22T13:20:36Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"ced4bb7b563fbec355a184439a99a0b4572071f2cada9033875e01ec35eb9c7e","abstract_canon_sha256":"7485c15c8c3f9b4c1f6697792e4c7cfd7b4273c8a8f8e1fc62a5a3ca5fde8ea9"},"schema_version":"1.0"},"canonical_sha256":"b2cc59f085e55febcc10d91422c180b4e85f4ac6a2b89c52909aafbf5ad9373e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:53:24.180396Z","signature_b64":"Rz6/hzLkAa1oBSGm8L5SMozgU1oaVWQRRJXYqCRadwq5CuIVnlib5lqOHGML/BSp8wmuRWe4dEpPe9VleDV8Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b2cc59f085e55febcc10d91422c180b4e85f4ac6a2b89c52909aafbf5ad9373e","last_reissued_at":"2026-05-17T23:53:24.179592Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:53:24.179592Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.09162","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:53:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nwH8bFNzhZ3Js9/xWIRAVd5lzgT61qElkzscPgXOJ/CVUfr0hDvEeOfpAqNoZPItFbr7eKT2KYf4yG7OT5dHBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T14:58:57.329344Z"},"content_sha256":"3e5f8d8a0cf0e812fc66154d98bbf0b423ec2d733d753e10962928dd9d026faa","schema_version":"1.0","event_id":"sha256:3e5f8d8a0cf0e812fc66154d98bbf0b423ec2d733d753e10962928dd9d026faa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:WLGFT4EF4VP6XTAQ3EKCFQMAWT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectral observations of X Persei: Connection between H-alpha and X-ray emission","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.SR","authors_text":"D. Marchev, K. A. Stoyanov, N. I. Petrov, R. Zamanov, U. Wolter","submitted_at":"2018-11-22T13:20:36Z","abstract_excerpt":"We present spectroscopic observations of the Be/X-ray binary X Per obtained during the period 1999 - 2018. Using new and published data, we found that during \"disc-rise\" the expansion velocity of the circumstellar disc is 0.4 - 0.7 km/s. Our results suggest that the disc radius in recent decades show evidence of resonant truncation of the disc by resonances 10:1, 3:1, and 2:1, while the maximum disc size is larger than the Roche lobe of the primary and smaller than the closest approach of the neutron star. We find correlation between equivalent width of H-alpha emission line ($W\\alpha$) and th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.09162","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:53:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mAs3bQAqotOlGbgn50MQNziEsIH0agX5eoRMDegzvGEpw0bixrnjlhVX1HQwpwuAnzJyfsdseqtqsLEVAYr5CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T14:58:57.329689Z"},"content_sha256":"4c1e55144a6d4414c1f7427f372a073f07230aea023ff1c3dd34866275fafb51","schema_version":"1.0","event_id":"sha256:4c1e55144a6d4414c1f7427f372a073f07230aea023ff1c3dd34866275fafb51"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WLGFT4EF4VP6XTAQ3EKCFQMAWT/bundle.json","state_url":"https://pith.science/pith/WLGFT4EF4VP6XTAQ3EKCFQMAWT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WLGFT4EF4VP6XTAQ3EKCFQMAWT/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-28T14:58:57Z","links":{"resolver":"https://pith.science/pith/WLGFT4EF4VP6XTAQ3EKCFQMAWT","bundle":"https://pith.science/pith/WLGFT4EF4VP6XTAQ3EKCFQMAWT/bundle.json","state":"https://pith.science/pith/WLGFT4EF4VP6XTAQ3EKCFQMAWT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WLGFT4EF4VP6XTAQ3EKCFQMAWT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:WLGFT4EF4VP6XTAQ3EKCFQMAWT","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":"7485c15c8c3f9b4c1f6697792e4c7cfd7b4273c8a8f8e1fc62a5a3ca5fde8ea9","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-11-22T13:20:36Z","title_canon_sha256":"ced4bb7b563fbec355a184439a99a0b4572071f2cada9033875e01ec35eb9c7e"},"schema_version":"1.0","source":{"id":"1811.09162","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.09162","created_at":"2026-05-17T23:53:24Z"},{"alias_kind":"arxiv_version","alias_value":"1811.09162v2","created_at":"2026-05-17T23:53:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.09162","created_at":"2026-05-17T23:53:24Z"},{"alias_kind":"pith_short_12","alias_value":"WLGFT4EF4VP6","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WLGFT4EF4VP6XTAQ","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WLGFT4EF","created_at":"2026-05-18T12:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:4c1e55144a6d4414c1f7427f372a073f07230aea023ff1c3dd34866275fafb51","target":"graph","created_at":"2026-05-17T23:53:24Z","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 spectroscopic observations of the Be/X-ray binary X Per obtained during the period 1999 - 2018. Using new and published data, we found that during \"disc-rise\" the expansion velocity of the circumstellar disc is 0.4 - 0.7 km/s. Our results suggest that the disc radius in recent decades show evidence of resonant truncation of the disc by resonances 10:1, 3:1, and 2:1, while the maximum disc size is larger than the Roche lobe of the primary and smaller than the closest approach of the neutron star. We find correlation between equivalent width of H-alpha emission line ($W\\alpha$) and th","authors_text":"D. Marchev, K. A. Stoyanov, N. I. Petrov, R. Zamanov, U. Wolter","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-11-22T13:20:36Z","title":"Spectral observations of X Persei: Connection between H-alpha and X-ray emission"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.09162","kind":"arxiv","version":2},"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":"sha256:3e5f8d8a0cf0e812fc66154d98bbf0b423ec2d733d753e10962928dd9d026faa","target":"record","created_at":"2026-05-17T23:53:24Z","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":"7485c15c8c3f9b4c1f6697792e4c7cfd7b4273c8a8f8e1fc62a5a3ca5fde8ea9","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-11-22T13:20:36Z","title_canon_sha256":"ced4bb7b563fbec355a184439a99a0b4572071f2cada9033875e01ec35eb9c7e"},"schema_version":"1.0","source":{"id":"1811.09162","kind":"arxiv","version":2}},"canonical_sha256":"b2cc59f085e55febcc10d91422c180b4e85f4ac6a2b89c52909aafbf5ad9373e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b2cc59f085e55febcc10d91422c180b4e85f4ac6a2b89c52909aafbf5ad9373e","first_computed_at":"2026-05-17T23:53:24.179592Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:53:24.179592Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Rz6/hzLkAa1oBSGm8L5SMozgU1oaVWQRRJXYqCRadwq5CuIVnlib5lqOHGML/BSp8wmuRWe4dEpPe9VleDV8Bg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:53:24.180396Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.09162","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3e5f8d8a0cf0e812fc66154d98bbf0b423ec2d733d753e10962928dd9d026faa","sha256:4c1e55144a6d4414c1f7427f372a073f07230aea023ff1c3dd34866275fafb51"],"state_sha256":"bb96710b683bf4275a0a8b6c52729325d58da6abff209b3f7aa37081d57ea3c5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2wN4nHd4vRTLLPlCvHLmQuPjOYyuGSHlTb+rW6slK/cDi1tp8njU33XRFI2dL+ePMdvA9v6w+RliQKhFpXowBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T14:58:57.331776Z","bundle_sha256":"d79acd94d1eea56362af475cced50c238632ecb30e0093384c58cac2bb35cccc"}}