{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:KWBEADPNVLYWF76X7VYBL62UGA","short_pith_number":"pith:KWBEADPN","canonical_record":{"source":{"id":"1707.08585","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-07-26T18:01:17Z","cross_cats_sorted":[],"title_canon_sha256":"8affad646bbf47a27d85f1ca3a1b51a246aa415d93cccb7933f1901a9c492398","abstract_canon_sha256":"752de792dabcf0277acaced8d063f8def2d163256ae6b70711b8327da459af95"},"schema_version":"1.0"},"canonical_sha256":"5582400dedaaf162ffd7fd7015fb5430023c3e67a09eef0e8e7125f2537ca984","source":{"kind":"arxiv","id":"1707.08585","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.08585","created_at":"2026-05-18T00:38:01Z"},{"alias_kind":"arxiv_version","alias_value":"1707.08585v1","created_at":"2026-05-18T00:38:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.08585","created_at":"2026-05-18T00:38:01Z"},{"alias_kind":"pith_short_12","alias_value":"KWBEADPNVLYW","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_16","alias_value":"KWBEADPNVLYWF76X","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_8","alias_value":"KWBEADPN","created_at":"2026-05-18T12:31:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:KWBEADPNVLYWF76X7VYBL62UGA","target":"record","payload":{"canonical_record":{"source":{"id":"1707.08585","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-07-26T18:01:17Z","cross_cats_sorted":[],"title_canon_sha256":"8affad646bbf47a27d85f1ca3a1b51a246aa415d93cccb7933f1901a9c492398","abstract_canon_sha256":"752de792dabcf0277acaced8d063f8def2d163256ae6b70711b8327da459af95"},"schema_version":"1.0"},"canonical_sha256":"5582400dedaaf162ffd7fd7015fb5430023c3e67a09eef0e8e7125f2537ca984","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:38:01.679281Z","signature_b64":"a8PbjSJcv7D3zaGq/meZK9WnecJ55n3jSfDfj0bsR4CJAXeDJlGPwYYMfLV1FCpgc2aO56uV9ymzqe3F8VW9Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5582400dedaaf162ffd7fd7015fb5430023c3e67a09eef0e8e7125f2537ca984","last_reissued_at":"2026-05-18T00:38:01.678624Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:38:01.678624Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1707.08585","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":"2026-05-18T00:38:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G9ojGMxbGu7gVFch14s0R8yf8kP2W+jPK7iwTSjgBl2G8sSggd44EECx0/Y3PQf74fFvJcRlP0n4NBLdkRlJAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T04:00:25.892870Z"},"content_sha256":"d2b5cb571584b54ec768c0f7b90d0e586c1049f2ca6502af5581f2ccc99f5b6c","schema_version":"1.0","event_id":"sha256:d2b5cb571584b54ec768c0f7b90d0e586c1049f2ca6502af5581f2ccc99f5b6c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:KWBEADPNVLYWF76X7VYBL62UGA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The [Y/Mg] clock works for evolved solar metallicity stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"2), (2) University of Birmingham (3) Caltech (4) Leiden Observatory, (5) KULeuven), Aarhus University, A. O. Thygesen (3), D. Slumstrup (1), F. Grundahl (1), J. Jessen-Hansen (1), K. Brogaard (1, Leiden University, M. G. Pedersen (5) ((1) SAC, P. E. Nissen (1), V. Van Eylen (4)","submitted_at":"2017-07-26T18:01:17Z","abstract_excerpt":"Previously [Y/Mg] has been proven to be an age indicator for solar twins. Here, we investigate if this relation also holds for helium-core-burning stars of solar metallicity. High resolution and high signal-to-noise ratio (S/N) spectroscopic data of stars in the helium-core-burning phase have been obtained with the FIES spectrograph on the NOT 2.56m telescope and the HIRES spectrograph on the Keck I 10 m telescope. They have been analyzed to determine the chemical abundances of four open clusters with close to solar metallicity; NGC 6811, NGC 6819, M67 and NGC 188. The abundances are derived f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.08585","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":"2026-05-18T00:38:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"x9vf8IjH+7RaN2vH6JaM9zgraqnrpcmnOGB4q6xarxapQiMQunyy05qUdMDmogqWwaNfcYaWHiZRAQ6oLBwQBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T04:00:25.893206Z"},"content_sha256":"9bccd9f53fe780b37d2f2c9b565fe11767301d6875e370d1ae7ab4d639fc7a8d","schema_version":"1.0","event_id":"sha256:9bccd9f53fe780b37d2f2c9b565fe11767301d6875e370d1ae7ab4d639fc7a8d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KWBEADPNVLYWF76X7VYBL62UGA/bundle.json","state_url":"https://pith.science/pith/KWBEADPNVLYWF76X7VYBL62UGA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KWBEADPNVLYWF76X7VYBL62UGA/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":"2026-06-01T04:00:25Z","links":{"resolver":"https://pith.science/pith/KWBEADPNVLYWF76X7VYBL62UGA","bundle":"https://pith.science/pith/KWBEADPNVLYWF76X7VYBL62UGA/bundle.json","state":"https://pith.science/pith/KWBEADPNVLYWF76X7VYBL62UGA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KWBEADPNVLYWF76X7VYBL62UGA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:KWBEADPNVLYWF76X7VYBL62UGA","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":"752de792dabcf0277acaced8d063f8def2d163256ae6b70711b8327da459af95","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-07-26T18:01:17Z","title_canon_sha256":"8affad646bbf47a27d85f1ca3a1b51a246aa415d93cccb7933f1901a9c492398"},"schema_version":"1.0","source":{"id":"1707.08585","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.08585","created_at":"2026-05-18T00:38:01Z"},{"alias_kind":"arxiv_version","alias_value":"1707.08585v1","created_at":"2026-05-18T00:38:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.08585","created_at":"2026-05-18T00:38:01Z"},{"alias_kind":"pith_short_12","alias_value":"KWBEADPNVLYW","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_16","alias_value":"KWBEADPNVLYWF76X","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_8","alias_value":"KWBEADPN","created_at":"2026-05-18T12:31:28Z"}],"graph_snapshots":[{"event_id":"sha256:9bccd9f53fe780b37d2f2c9b565fe11767301d6875e370d1ae7ab4d639fc7a8d","target":"graph","created_at":"2026-05-18T00:38:01Z","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":"Previously [Y/Mg] has been proven to be an age indicator for solar twins. Here, we investigate if this relation also holds for helium-core-burning stars of solar metallicity. High resolution and high signal-to-noise ratio (S/N) spectroscopic data of stars in the helium-core-burning phase have been obtained with the FIES spectrograph on the NOT 2.56m telescope and the HIRES spectrograph on the Keck I 10 m telescope. They have been analyzed to determine the chemical abundances of four open clusters with close to solar metallicity; NGC 6811, NGC 6819, M67 and NGC 188. The abundances are derived f","authors_text":"2), (2) University of Birmingham (3) Caltech (4) Leiden Observatory, (5) KULeuven), Aarhus University, A. O. Thygesen (3), D. Slumstrup (1), F. Grundahl (1), J. Jessen-Hansen (1), K. Brogaard (1, Leiden University, M. G. Pedersen (5) ((1) SAC, P. E. Nissen (1), V. Van Eylen (4)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-07-26T18:01:17Z","title":"The [Y/Mg] clock works for evolved solar metallicity stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.08585","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:d2b5cb571584b54ec768c0f7b90d0e586c1049f2ca6502af5581f2ccc99f5b6c","target":"record","created_at":"2026-05-18T00:38:01Z","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":"752de792dabcf0277acaced8d063f8def2d163256ae6b70711b8327da459af95","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-07-26T18:01:17Z","title_canon_sha256":"8affad646bbf47a27d85f1ca3a1b51a246aa415d93cccb7933f1901a9c492398"},"schema_version":"1.0","source":{"id":"1707.08585","kind":"arxiv","version":1}},"canonical_sha256":"5582400dedaaf162ffd7fd7015fb5430023c3e67a09eef0e8e7125f2537ca984","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5582400dedaaf162ffd7fd7015fb5430023c3e67a09eef0e8e7125f2537ca984","first_computed_at":"2026-05-18T00:38:01.678624Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:38:01.678624Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"a8PbjSJcv7D3zaGq/meZK9WnecJ55n3jSfDfj0bsR4CJAXeDJlGPwYYMfLV1FCpgc2aO56uV9ymzqe3F8VW9Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:38:01.679281Z","signed_message":"canonical_sha256_bytes"},"source_id":"1707.08585","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d2b5cb571584b54ec768c0f7b90d0e586c1049f2ca6502af5581f2ccc99f5b6c","sha256:9bccd9f53fe780b37d2f2c9b565fe11767301d6875e370d1ae7ab4d639fc7a8d"],"state_sha256":"d8954957d45f2973e1cbeaa795583804d04b7ba32d22880014189127bd36f450"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nLVlb5FfeQryVhKZNNMjXTEdPz4pNWCRchH4LsEG7w7I/s0LtMetx5tDOIAEYSuROSemLLXv6EEJ58/4d/72AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T04:00:25.895086Z","bundle_sha256":"c18ee83bc13e88c0b18676290724707a57d439b8153fdc4d1123e2a10a472477"}}