{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:23SXJUKGY3N7CZYSGUHCHCD5TO","short_pith_number":"pith:23SXJUKG","canonical_record":{"source":{"id":"0907.2975","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-07-17T04:28:18Z","cross_cats_sorted":[],"title_canon_sha256":"68584c4c825def286ece9b7ce9283d1cd3a7b1d2ef78d52d776f569e5849e809","abstract_canon_sha256":"17940d42f0be16f2ab1ef7f6dfc7d8edf8dfde3da89ab9e43854b63e0809b160"},"schema_version":"1.0"},"canonical_sha256":"d6e574d146c6dbf16712350e23887d9bbf686f2a7adf418c8ec47817b7b71348","source":{"kind":"arxiv","id":"0907.2975","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.2975","created_at":"2026-05-18T02:12:56Z"},{"alias_kind":"arxiv_version","alias_value":"0907.2975v1","created_at":"2026-05-18T02:12:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.2975","created_at":"2026-05-18T02:12:56Z"},{"alias_kind":"pith_short_12","alias_value":"23SXJUKGY3N7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"23SXJUKGY3N7CZYS","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"23SXJUKG","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:23SXJUKGY3N7CZYSGUHCHCD5TO","target":"record","payload":{"canonical_record":{"source":{"id":"0907.2975","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-07-17T04:28:18Z","cross_cats_sorted":[],"title_canon_sha256":"68584c4c825def286ece9b7ce9283d1cd3a7b1d2ef78d52d776f569e5849e809","abstract_canon_sha256":"17940d42f0be16f2ab1ef7f6dfc7d8edf8dfde3da89ab9e43854b63e0809b160"},"schema_version":"1.0"},"canonical_sha256":"d6e574d146c6dbf16712350e23887d9bbf686f2a7adf418c8ec47817b7b71348","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:12:56.325734Z","signature_b64":"E6Dc2G4ORAJWT1KZeAHXDAiEuX1+Xti/K8lcYifRUJ1lWYQwqEFhpKF+ys64ODReQ5weu3AoArmDFtz8oVsECw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d6e574d146c6dbf16712350e23887d9bbf686f2a7adf418c8ec47817b7b71348","last_reissued_at":"2026-05-18T02:12:56.325060Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:12:56.325060Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0907.2975","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:12:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mJKjiY2ULvOnl1HI8aMMnD8dM4DQdlRHEEwX5n2nXzhlbfSBkPrH9hfpKu9GUekQPgMYQr5eTeTAxEOI8CN1CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:12:26.856299Z"},"content_sha256":"b315bfd154bd7df7781ea6f6a0ead7a15ddc83df0f2729240341d35f91dc0461","schema_version":"1.0","event_id":"sha256:b315bfd154bd7df7781ea6f6a0ead7a15ddc83df0f2729240341d35f91dc0461"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:23SXJUKGY3N7CZYSGUHCHCD5TO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Long Secondary Periods in Variable Red Giants","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"C. P. Nicholls, I. Soszy\\'nski, M.-R. L. Cioni, P. R. Wood","submitted_at":"2009-07-17T04:28:18Z","abstract_excerpt":"We present a study of a sample of LMC red giants exhibiting Long Secondary Periods (LSPs). We use radial velocities obtained from VLT spectral observations and MACHO and OGLE light curves to examine properties of the stars and to evaluate models for the cause of LSPs. This sample is much larger than the combined previous studies of Hinkle et al. (2002) and Wood, Olivier & Kawaler (2004). Binary and pulsation models have enjoyed much support in recent years. Assuming stellar pulsation, we calculate from the velocity curves that the typical fractional radius change over an LSP cycle is greater t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.2975","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:12:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bb9wSqx6cRQaEm/htjrpSUNOlyFo5kjhmfzyh58w47pU8pwvZD+UqClCa3kzMOdkX4Ie4p9XHjia8+h9Kg9zCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:12:26.856855Z"},"content_sha256":"06efbd6cd54a3af6f531a510550d64cdc0d2b10592849c9b9805e913e86e1904","schema_version":"1.0","event_id":"sha256:06efbd6cd54a3af6f531a510550d64cdc0d2b10592849c9b9805e913e86e1904"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/23SXJUKGY3N7CZYSGUHCHCD5TO/bundle.json","state_url":"https://pith.science/pith/23SXJUKGY3N7CZYSGUHCHCD5TO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/23SXJUKGY3N7CZYSGUHCHCD5TO/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":"2026-05-26T11:12:26Z","links":{"resolver":"https://pith.science/pith/23SXJUKGY3N7CZYSGUHCHCD5TO","bundle":"https://pith.science/pith/23SXJUKGY3N7CZYSGUHCHCD5TO/bundle.json","state":"https://pith.science/pith/23SXJUKGY3N7CZYSGUHCHCD5TO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/23SXJUKGY3N7CZYSGUHCHCD5TO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:23SXJUKGY3N7CZYSGUHCHCD5TO","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":"17940d42f0be16f2ab1ef7f6dfc7d8edf8dfde3da89ab9e43854b63e0809b160","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-07-17T04:28:18Z","title_canon_sha256":"68584c4c825def286ece9b7ce9283d1cd3a7b1d2ef78d52d776f569e5849e809"},"schema_version":"1.0","source":{"id":"0907.2975","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.2975","created_at":"2026-05-18T02:12:56Z"},{"alias_kind":"arxiv_version","alias_value":"0907.2975v1","created_at":"2026-05-18T02:12:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.2975","created_at":"2026-05-18T02:12:56Z"},{"alias_kind":"pith_short_12","alias_value":"23SXJUKGY3N7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"23SXJUKGY3N7CZYS","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"23SXJUKG","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:06efbd6cd54a3af6f531a510550d64cdc0d2b10592849c9b9805e913e86e1904","target":"graph","created_at":"2026-05-18T02:12:56Z","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 a study of a sample of LMC red giants exhibiting Long Secondary Periods (LSPs). We use radial velocities obtained from VLT spectral observations and MACHO and OGLE light curves to examine properties of the stars and to evaluate models for the cause of LSPs. This sample is much larger than the combined previous studies of Hinkle et al. (2002) and Wood, Olivier & Kawaler (2004). Binary and pulsation models have enjoyed much support in recent years. Assuming stellar pulsation, we calculate from the velocity curves that the typical fractional radius change over an LSP cycle is greater t","authors_text":"C. P. Nicholls, I. Soszy\\'nski, M.-R. L. Cioni, P. R. Wood","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-07-17T04:28:18Z","title":"Long Secondary Periods in Variable Red Giants"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.2975","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:b315bfd154bd7df7781ea6f6a0ead7a15ddc83df0f2729240341d35f91dc0461","target":"record","created_at":"2026-05-18T02:12:56Z","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":"17940d42f0be16f2ab1ef7f6dfc7d8edf8dfde3da89ab9e43854b63e0809b160","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-07-17T04:28:18Z","title_canon_sha256":"68584c4c825def286ece9b7ce9283d1cd3a7b1d2ef78d52d776f569e5849e809"},"schema_version":"1.0","source":{"id":"0907.2975","kind":"arxiv","version":1}},"canonical_sha256":"d6e574d146c6dbf16712350e23887d9bbf686f2a7adf418c8ec47817b7b71348","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d6e574d146c6dbf16712350e23887d9bbf686f2a7adf418c8ec47817b7b71348","first_computed_at":"2026-05-18T02:12:56.325060Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:56.325060Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"E6Dc2G4ORAJWT1KZeAHXDAiEuX1+Xti/K8lcYifRUJ1lWYQwqEFhpKF+ys64ODReQ5weu3AoArmDFtz8oVsECw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:56.325734Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.2975","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b315bfd154bd7df7781ea6f6a0ead7a15ddc83df0f2729240341d35f91dc0461","sha256:06efbd6cd54a3af6f531a510550d64cdc0d2b10592849c9b9805e913e86e1904"],"state_sha256":"9e61658711e13aad8524888cc7e37bf761e041205fe249607961f1a44555fd95"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"njZ4mMve9P+HvLW16u6UZYgmZoauANGZ0Zjd6v1zwHwwmVvDLdTNycP7Sjsvc0gf+a7aWa9rbelqnw9sG25IDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T11:12:26.859995Z","bundle_sha256":"f04b0415fabd996708051758a4503322da7934c0ff0c73e20baf033760a967f6"}}