{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:A7XCKBSYNBIIXFBHR4AT4PFRZB","short_pith_number":"pith:A7XCKBSY","canonical_record":{"source":{"id":"1511.03470","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-11T12:11:05Z","cross_cats_sorted":[],"title_canon_sha256":"77b4c088c23f2ff38898bab859e228c1e419210e41294d57ec44ed465e1a5317","abstract_canon_sha256":"0b6dee1a0191f9abc65459910b7121da206c9ca9d0aced240c2adbe63787e813"},"schema_version":"1.0"},"canonical_sha256":"07ee25065868508b94278f013e3cb1c866dbb3819f94cd02438987036cbc72fa","source":{"kind":"arxiv","id":"1511.03470","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.03470","created_at":"2026-05-18T01:26:40Z"},{"alias_kind":"arxiv_version","alias_value":"1511.03470v2","created_at":"2026-05-18T01:26:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.03470","created_at":"2026-05-18T01:26:40Z"},{"alias_kind":"pith_short_12","alias_value":"A7XCKBSYNBII","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_16","alias_value":"A7XCKBSYNBIIXFBH","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_8","alias_value":"A7XCKBSY","created_at":"2026-05-18T12:29:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:A7XCKBSYNBIIXFBHR4AT4PFRZB","target":"record","payload":{"canonical_record":{"source":{"id":"1511.03470","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-11T12:11:05Z","cross_cats_sorted":[],"title_canon_sha256":"77b4c088c23f2ff38898bab859e228c1e419210e41294d57ec44ed465e1a5317","abstract_canon_sha256":"0b6dee1a0191f9abc65459910b7121da206c9ca9d0aced240c2adbe63787e813"},"schema_version":"1.0"},"canonical_sha256":"07ee25065868508b94278f013e3cb1c866dbb3819f94cd02438987036cbc72fa","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:26:40.570951Z","signature_b64":"c8rYImmqIHQMtv9nq/obZ3ROkJ3zmZwh1IkzkgVIoOcryUDhW3NgrkaQSDfKZq+Dbr7T21mz443OQfGvlhKNAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"07ee25065868508b94278f013e3cb1c866dbb3819f94cd02438987036cbc72fa","last_reissued_at":"2026-05-18T01:26:40.570292Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:26:40.570292Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1511.03470","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":"2026-05-18T01:26:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UlDPda3WqARK7JN5vueKPXmGINZexZFOgNT+Sx1CMFvlq3rdigkhdM1A3woOP4jvDSBXbLwMjrXmgmtrhHMjAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:34:34.960064Z"},"content_sha256":"acb49c3c09c4d38fb029fd276f07a78c143d1aa43c2b76484c3406c5173f3c2d","schema_version":"1.0","event_id":"sha256:acb49c3c09c4d38fb029fd276f07a78c143d1aa43c2b76484c3406c5173f3c2d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:A7XCKBSYNBIIXFBHR4AT4PFRZB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectroscopic and photometric analysis of the early-type spectroscopic binary HD 161853 in the centre of an H II region","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Sota, C. Putkuri, E. J. Alfaro, J. I. Arias, J. Ma\\'iz Apell\\'aniz, N. I. Morrell, N. R. Walborn, R. Gamen, R. H. Barb\\'a","submitted_at":"2015-11-11T12:11:05Z","abstract_excerpt":"We study the O-type star HD 161853, which has been noted as a probable double-lined spectroscopic binary system. We secured high-resolution spectra of HD 161853 during the past nine years. We separated the two components in the system and measured their respective radial velocities for the first time. We confirm that HD 161853 is an $\\sim$1 Ma old binary system consisting of an O8 V star ($M_{\\rm A,RV} \\geq 22$ M$_\\odot$) and a B1--3 V star ($M_{\\rm B,RV} \\geq 7.2$ M$_\\odot$) at about 1.3 kpc. From the radial velocity curve, we measure an orbital period $P$ = 2.66765$\\pm$0.00001 d and an eccen"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.03470","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":"2026-05-18T01:26:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"L6C1An7HfhW5+OyALRDhXLXnGKSFsiwQXRHuYAu2O/Ii1VqsrRdMBqpUlr1DpNFiaEO4bW3/BxykDI/1W7XMAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:34:34.960757Z"},"content_sha256":"87f568e66fac96e8d671bcad46522f601b83b2394c727cbb26185de2910cbe61","schema_version":"1.0","event_id":"sha256:87f568e66fac96e8d671bcad46522f601b83b2394c727cbb26185de2910cbe61"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/A7XCKBSYNBIIXFBHR4AT4PFRZB/bundle.json","state_url":"https://pith.science/pith/A7XCKBSYNBIIXFBHR4AT4PFRZB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/A7XCKBSYNBIIXFBHR4AT4PFRZB/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":"2026-05-25T16:34:34Z","links":{"resolver":"https://pith.science/pith/A7XCKBSYNBIIXFBHR4AT4PFRZB","bundle":"https://pith.science/pith/A7XCKBSYNBIIXFBHR4AT4PFRZB/bundle.json","state":"https://pith.science/pith/A7XCKBSYNBIIXFBHR4AT4PFRZB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/A7XCKBSYNBIIXFBHR4AT4PFRZB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:A7XCKBSYNBIIXFBHR4AT4PFRZB","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":"0b6dee1a0191f9abc65459910b7121da206c9ca9d0aced240c2adbe63787e813","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-11T12:11:05Z","title_canon_sha256":"77b4c088c23f2ff38898bab859e228c1e419210e41294d57ec44ed465e1a5317"},"schema_version":"1.0","source":{"id":"1511.03470","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.03470","created_at":"2026-05-18T01:26:40Z"},{"alias_kind":"arxiv_version","alias_value":"1511.03470v2","created_at":"2026-05-18T01:26:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.03470","created_at":"2026-05-18T01:26:40Z"},{"alias_kind":"pith_short_12","alias_value":"A7XCKBSYNBII","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_16","alias_value":"A7XCKBSYNBIIXFBH","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_8","alias_value":"A7XCKBSY","created_at":"2026-05-18T12:29:10Z"}],"graph_snapshots":[{"event_id":"sha256:87f568e66fac96e8d671bcad46522f601b83b2394c727cbb26185de2910cbe61","target":"graph","created_at":"2026-05-18T01:26:40Z","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 study the O-type star HD 161853, which has been noted as a probable double-lined spectroscopic binary system. We secured high-resolution spectra of HD 161853 during the past nine years. We separated the two components in the system and measured their respective radial velocities for the first time. We confirm that HD 161853 is an $\\sim$1 Ma old binary system consisting of an O8 V star ($M_{\\rm A,RV} \\geq 22$ M$_\\odot$) and a B1--3 V star ($M_{\\rm B,RV} \\geq 7.2$ M$_\\odot$) at about 1.3 kpc. From the radial velocity curve, we measure an orbital period $P$ = 2.66765$\\pm$0.00001 d and an eccen","authors_text":"A. Sota, C. Putkuri, E. J. Alfaro, J. I. Arias, J. Ma\\'iz Apell\\'aniz, N. I. Morrell, N. R. Walborn, R. Gamen, R. H. Barb\\'a","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-11T12:11:05Z","title":"Spectroscopic and photometric analysis of the early-type spectroscopic binary HD 161853 in the centre of an H II region"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.03470","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:acb49c3c09c4d38fb029fd276f07a78c143d1aa43c2b76484c3406c5173f3c2d","target":"record","created_at":"2026-05-18T01:26:40Z","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":"0b6dee1a0191f9abc65459910b7121da206c9ca9d0aced240c2adbe63787e813","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-11T12:11:05Z","title_canon_sha256":"77b4c088c23f2ff38898bab859e228c1e419210e41294d57ec44ed465e1a5317"},"schema_version":"1.0","source":{"id":"1511.03470","kind":"arxiv","version":2}},"canonical_sha256":"07ee25065868508b94278f013e3cb1c866dbb3819f94cd02438987036cbc72fa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"07ee25065868508b94278f013e3cb1c866dbb3819f94cd02438987036cbc72fa","first_computed_at":"2026-05-18T01:26:40.570292Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:26:40.570292Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"c8rYImmqIHQMtv9nq/obZ3ROkJ3zmZwh1IkzkgVIoOcryUDhW3NgrkaQSDfKZq+Dbr7T21mz443OQfGvlhKNAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:26:40.570951Z","signed_message":"canonical_sha256_bytes"},"source_id":"1511.03470","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:acb49c3c09c4d38fb029fd276f07a78c143d1aa43c2b76484c3406c5173f3c2d","sha256:87f568e66fac96e8d671bcad46522f601b83b2394c727cbb26185de2910cbe61"],"state_sha256":"ce84938645376252c5e6ac289d59b479c1326c4e987cb7ada39f85739ae76028"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XkMyegkrUoBujTMvSut8EvI9Jy1Kb2UUDI2ejJs2R59ssbvjc7/PKeMs7tjMhX2qa/Qzo8wZuWrRAmZvOeADAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T16:34:34.964693Z","bundle_sha256":"29cf4a782095e9eb6778a9464623f6bfe2497966e708337492ebc782e8018478"}}