{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:VKPS4YSUN5MH3I2RVRP6KPMBL4","short_pith_number":"pith:VKPS4YSU","canonical_record":{"source":{"id":"1405.7560","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-05-29T14:17:05Z","cross_cats_sorted":[],"title_canon_sha256":"4c39cdcaba5f9ebebef214cbd979596db73190c440a7c3a90e900c6af86d9c7c","abstract_canon_sha256":"1401b37995b5654fb62d456aad4975668aff45ede70f3533bdbe4e7eced7b057"},"schema_version":"1.0"},"canonical_sha256":"aa9f2e62546f587da351ac5fe53d815f284171997c72e3bc396c80f29f24d2ec","source":{"kind":"arxiv","id":"1405.7560","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.7560","created_at":"2026-05-18T02:50:50Z"},{"alias_kind":"arxiv_version","alias_value":"1405.7560v1","created_at":"2026-05-18T02:50:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.7560","created_at":"2026-05-18T02:50:50Z"},{"alias_kind":"pith_short_12","alias_value":"VKPS4YSUN5MH","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_16","alias_value":"VKPS4YSUN5MH3I2R","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_8","alias_value":"VKPS4YSU","created_at":"2026-05-18T12:28:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:VKPS4YSUN5MH3I2RVRP6KPMBL4","target":"record","payload":{"canonical_record":{"source":{"id":"1405.7560","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-05-29T14:17:05Z","cross_cats_sorted":[],"title_canon_sha256":"4c39cdcaba5f9ebebef214cbd979596db73190c440a7c3a90e900c6af86d9c7c","abstract_canon_sha256":"1401b37995b5654fb62d456aad4975668aff45ede70f3533bdbe4e7eced7b057"},"schema_version":"1.0"},"canonical_sha256":"aa9f2e62546f587da351ac5fe53d815f284171997c72e3bc396c80f29f24d2ec","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:50:50.957769Z","signature_b64":"qB4UZa/F7C8pR9fMMqe4h2EkainFKOzoId7031pS4p60/EdLtBfWVl3s6QAHWOiZd/93B0fPaWywNgFrQ4COAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aa9f2e62546f587da351ac5fe53d815f284171997c72e3bc396c80f29f24d2ec","last_reissued_at":"2026-05-18T02:50:50.957133Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:50:50.957133Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1405.7560","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":"2026-05-18T02:50:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6QM2tV7f/72w2NFr2Mxz7Ar+IxloKVZnwEDixNham82c8q3zbzgpC0U69fWGP1cbVcnFl8w4r9IKM61uuFS/AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-04T03:07:48.801622Z"},"content_sha256":"26897f8d2dfe837cd3d714541c15f2cb53f63fceee31ed4b1ce1e7e5410cea6e","schema_version":"1.0","event_id":"sha256:26897f8d2dfe837cd3d714541c15f2cb53f63fceee31ed4b1ce1e7e5410cea6e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:VKPS4YSUN5MH3I2RVRP6KPMBL4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Does the Period of a Pulsating Star Depend on its Amplitude?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Jeong Yeon (JY) Yook, John R. Percy","submitted_at":"2014-05-29T14:17:05Z","abstract_excerpt":"Several classes of pulsating stars are now known to undergo slow changes in amplitude; these include pulsating red giants and supergiants, and yellow supergiants. We have used visual observations from the AAVSO International Database, and wavelet analysis of 39 red giants, 7 red supergiants, and 3 yellow supergiants, to test the hypothesis that an increase in amplitude would result in an increase in period, because of non-linear effects in the pulsation. For most of the stars, the results are complex and/or indeterminate, due to the limitations of the data, the small amplitude or amplitude var"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.7560","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":"2026-05-18T02:50:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eFVLNMmU9AAwL0w/hMxosVVFmwSpvVYHYgI88UEm8XPE2XUZCGTyS2Qif4bDiBEyaxxKjg7HXeWf6kUOtBACCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-04T03:07:48.801967Z"},"content_sha256":"a4d3039bd963ac7c2f44ad10f6ddda91977705de30bd2202e8a412283e10c946","schema_version":"1.0","event_id":"sha256:a4d3039bd963ac7c2f44ad10f6ddda91977705de30bd2202e8a412283e10c946"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VKPS4YSUN5MH3I2RVRP6KPMBL4/bundle.json","state_url":"https://pith.science/pith/VKPS4YSUN5MH3I2RVRP6KPMBL4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VKPS4YSUN5MH3I2RVRP6KPMBL4/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":"2026-07-04T03:07:48Z","links":{"resolver":"https://pith.science/pith/VKPS4YSUN5MH3I2RVRP6KPMBL4","bundle":"https://pith.science/pith/VKPS4YSUN5MH3I2RVRP6KPMBL4/bundle.json","state":"https://pith.science/pith/VKPS4YSUN5MH3I2RVRP6KPMBL4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VKPS4YSUN5MH3I2RVRP6KPMBL4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:VKPS4YSUN5MH3I2RVRP6KPMBL4","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":"1401b37995b5654fb62d456aad4975668aff45ede70f3533bdbe4e7eced7b057","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-05-29T14:17:05Z","title_canon_sha256":"4c39cdcaba5f9ebebef214cbd979596db73190c440a7c3a90e900c6af86d9c7c"},"schema_version":"1.0","source":{"id":"1405.7560","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.7560","created_at":"2026-05-18T02:50:50Z"},{"alias_kind":"arxiv_version","alias_value":"1405.7560v1","created_at":"2026-05-18T02:50:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.7560","created_at":"2026-05-18T02:50:50Z"},{"alias_kind":"pith_short_12","alias_value":"VKPS4YSUN5MH","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_16","alias_value":"VKPS4YSUN5MH3I2R","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_8","alias_value":"VKPS4YSU","created_at":"2026-05-18T12:28:54Z"}],"graph_snapshots":[{"event_id":"sha256:a4d3039bd963ac7c2f44ad10f6ddda91977705de30bd2202e8a412283e10c946","target":"graph","created_at":"2026-05-18T02:50:50Z","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":"Several classes of pulsating stars are now known to undergo slow changes in amplitude; these include pulsating red giants and supergiants, and yellow supergiants. We have used visual observations from the AAVSO International Database, and wavelet analysis of 39 red giants, 7 red supergiants, and 3 yellow supergiants, to test the hypothesis that an increase in amplitude would result in an increase in period, because of non-linear effects in the pulsation. For most of the stars, the results are complex and/or indeterminate, due to the limitations of the data, the small amplitude or amplitude var","authors_text":"Jeong Yeon (JY) Yook, John R. Percy","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-05-29T14:17:05Z","title":"Does the Period of a Pulsating Star Depend on its Amplitude?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.7560","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":"sha256:26897f8d2dfe837cd3d714541c15f2cb53f63fceee31ed4b1ce1e7e5410cea6e","target":"record","created_at":"2026-05-18T02:50:50Z","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":"1401b37995b5654fb62d456aad4975668aff45ede70f3533bdbe4e7eced7b057","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-05-29T14:17:05Z","title_canon_sha256":"4c39cdcaba5f9ebebef214cbd979596db73190c440a7c3a90e900c6af86d9c7c"},"schema_version":"1.0","source":{"id":"1405.7560","kind":"arxiv","version":1}},"canonical_sha256":"aa9f2e62546f587da351ac5fe53d815f284171997c72e3bc396c80f29f24d2ec","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aa9f2e62546f587da351ac5fe53d815f284171997c72e3bc396c80f29f24d2ec","first_computed_at":"2026-05-18T02:50:50.957133Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:50:50.957133Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qB4UZa/F7C8pR9fMMqe4h2EkainFKOzoId7031pS4p60/EdLtBfWVl3s6QAHWOiZd/93B0fPaWywNgFrQ4COAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:50:50.957769Z","signed_message":"canonical_sha256_bytes"},"source_id":"1405.7560","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:26897f8d2dfe837cd3d714541c15f2cb53f63fceee31ed4b1ce1e7e5410cea6e","sha256:a4d3039bd963ac7c2f44ad10f6ddda91977705de30bd2202e8a412283e10c946"],"state_sha256":"439655bb1d7a2b0950d647c8c15d2afad0be811aacf69c0cb20906c23df4cfc5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F5xsKVcFVjbcvNp8yO6g9HoZs4qDHXdg5iYaQISRzGKD+dJ7DUqWpLKxGs/ZFRlU/OicaT81BGT/7j9tAhiRCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-04T03:07:48.804044Z","bundle_sha256":"79096ff89fb8938ea39c247a9915c2aabe1d3cceab2b33f0aa4b6555edc0b380"}}