{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:DS6X4VJYKRJ3LBTSYAAYJZXSN5","short_pith_number":"pith:DS6X4VJY","canonical_record":{"source":{"id":"1004.3308","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-04-19T21:09:43Z","cross_cats_sorted":[],"title_canon_sha256":"c0f0161dc5cd786267aa63e56ee43ae30f6ebd0c7f2951bbcd494fe2716faaef","abstract_canon_sha256":"3b2e6407c9e3edf7fd911940f3a53e49f5fe3994bf64293502490298efa223d6"},"schema_version":"1.0"},"canonical_sha256":"1cbd7e55385453b58672c00184e6f26f7950a8d92863120a02a2f320056dc707","source":{"kind":"arxiv","id":"1004.3308","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1004.3308","created_at":"2026-05-18T02:07:56Z"},{"alias_kind":"arxiv_version","alias_value":"1004.3308v1","created_at":"2026-05-18T02:07:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1004.3308","created_at":"2026-05-18T02:07:56Z"},{"alias_kind":"pith_short_12","alias_value":"DS6X4VJYKRJ3","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_16","alias_value":"DS6X4VJYKRJ3LBTS","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_8","alias_value":"DS6X4VJY","created_at":"2026-05-18T12:26:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:DS6X4VJYKRJ3LBTSYAAYJZXSN5","target":"record","payload":{"canonical_record":{"source":{"id":"1004.3308","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-04-19T21:09:43Z","cross_cats_sorted":[],"title_canon_sha256":"c0f0161dc5cd786267aa63e56ee43ae30f6ebd0c7f2951bbcd494fe2716faaef","abstract_canon_sha256":"3b2e6407c9e3edf7fd911940f3a53e49f5fe3994bf64293502490298efa223d6"},"schema_version":"1.0"},"canonical_sha256":"1cbd7e55385453b58672c00184e6f26f7950a8d92863120a02a2f320056dc707","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:07:56.576031Z","signature_b64":"i1puWjfoYQN+1ggdGzYWR17j5MN3QPS6mx52nwmiYcgEuxconZCAlDksYU8Yu230UHKTdfhIPD8pcGz8YrQ7CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1cbd7e55385453b58672c00184e6f26f7950a8d92863120a02a2f320056dc707","last_reissued_at":"2026-05-18T02:07:56.575202Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:07:56.575202Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1004.3308","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":"2026-05-18T02:07:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"x4qx2s3iPbOO7lC31q3kvqac1R/4Se35LlafKcvzLsZhiD61xHSbQtLnBguO9+FFzWOsSjcJdftQXmFcLTo4Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T21:12:53.609286Z"},"content_sha256":"c3b07f7cf64e94c09928d598e29ba7a24c1af318d2bde35e1b2f8d6fd7c512f9","schema_version":"1.0","event_id":"sha256:c3b07f7cf64e94c09928d598e29ba7a24c1af318d2bde35e1b2f8d6fd7c512f9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:DS6X4VJYKRJ3LBTSYAAYJZXSN5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On using the CMD morphology of M67 to test solar abundances","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Achim Weiss, Aldo Serenelli, Brian Chaboyer, Zazralt Magic","submitted_at":"2010-04-19T21:09:43Z","abstract_excerpt":"The open cluster M67 has solar metallicity and an age of about 4Gyr. The turn-off mass is close to the minimum mass for which solar metallicity stars develop a convective core during main sequence evolution as a result of the development of hydrogen burning through the CNO-cycle. The morphology of the color-magnitude-diagram (CMD) of M67 around the turn-off shows a clear hook-like  feature,  direct  sign  that  stars  close  to  the  turn-off  have convective cores.  VandenBerg et al. investigated the  possibility of using the morphology of the M67 turn-off to put constraints on the solar meta"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.3308","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":"2026-05-18T02:07:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XyUJJkjIuQCiu4qCD7+3s25exjeZ+G4GZs3f96NbAOT7SBcTFNf4bxntRYPKglBfsSKNQVev1z3WNMIPsk4DCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T21:12:53.610015Z"},"content_sha256":"a27f79a7ff2dd9a7c9e4b5642427af8f7cc70fa4b077a124392358f5262bc73f","schema_version":"1.0","event_id":"sha256:a27f79a7ff2dd9a7c9e4b5642427af8f7cc70fa4b077a124392358f5262bc73f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DS6X4VJYKRJ3LBTSYAAYJZXSN5/bundle.json","state_url":"https://pith.science/pith/DS6X4VJYKRJ3LBTSYAAYJZXSN5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DS6X4VJYKRJ3LBTSYAAYJZXSN5/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":"2026-05-31T21:12:53Z","links":{"resolver":"https://pith.science/pith/DS6X4VJYKRJ3LBTSYAAYJZXSN5","bundle":"https://pith.science/pith/DS6X4VJYKRJ3LBTSYAAYJZXSN5/bundle.json","state":"https://pith.science/pith/DS6X4VJYKRJ3LBTSYAAYJZXSN5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DS6X4VJYKRJ3LBTSYAAYJZXSN5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:DS6X4VJYKRJ3LBTSYAAYJZXSN5","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":"3b2e6407c9e3edf7fd911940f3a53e49f5fe3994bf64293502490298efa223d6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-04-19T21:09:43Z","title_canon_sha256":"c0f0161dc5cd786267aa63e56ee43ae30f6ebd0c7f2951bbcd494fe2716faaef"},"schema_version":"1.0","source":{"id":"1004.3308","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1004.3308","created_at":"2026-05-18T02:07:56Z"},{"alias_kind":"arxiv_version","alias_value":"1004.3308v1","created_at":"2026-05-18T02:07:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1004.3308","created_at":"2026-05-18T02:07:56Z"},{"alias_kind":"pith_short_12","alias_value":"DS6X4VJYKRJ3","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_16","alias_value":"DS6X4VJYKRJ3LBTS","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_8","alias_value":"DS6X4VJY","created_at":"2026-05-18T12:26:06Z"}],"graph_snapshots":[{"event_id":"sha256:a27f79a7ff2dd9a7c9e4b5642427af8f7cc70fa4b077a124392358f5262bc73f","target":"graph","created_at":"2026-05-18T02:07:56Z","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":"The open cluster M67 has solar metallicity and an age of about 4Gyr. The turn-off mass is close to the minimum mass for which solar metallicity stars develop a convective core during main sequence evolution as a result of the development of hydrogen burning through the CNO-cycle. The morphology of the color-magnitude-diagram (CMD) of M67 around the turn-off shows a clear hook-like  feature,  direct  sign  that  stars  close  to  the  turn-off  have convective cores.  VandenBerg et al. investigated the  possibility of using the morphology of the M67 turn-off to put constraints on the solar meta","authors_text":"Achim Weiss, Aldo Serenelli, Brian Chaboyer, Zazralt Magic","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-04-19T21:09:43Z","title":"On using the CMD morphology of M67 to test solar abundances"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.3308","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:c3b07f7cf64e94c09928d598e29ba7a24c1af318d2bde35e1b2f8d6fd7c512f9","target":"record","created_at":"2026-05-18T02:07:56Z","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":"3b2e6407c9e3edf7fd911940f3a53e49f5fe3994bf64293502490298efa223d6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-04-19T21:09:43Z","title_canon_sha256":"c0f0161dc5cd786267aa63e56ee43ae30f6ebd0c7f2951bbcd494fe2716faaef"},"schema_version":"1.0","source":{"id":"1004.3308","kind":"arxiv","version":1}},"canonical_sha256":"1cbd7e55385453b58672c00184e6f26f7950a8d92863120a02a2f320056dc707","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1cbd7e55385453b58672c00184e6f26f7950a8d92863120a02a2f320056dc707","first_computed_at":"2026-05-18T02:07:56.575202Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:07:56.575202Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"i1puWjfoYQN+1ggdGzYWR17j5MN3QPS6mx52nwmiYcgEuxconZCAlDksYU8Yu230UHKTdfhIPD8pcGz8YrQ7CA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:07:56.576031Z","signed_message":"canonical_sha256_bytes"},"source_id":"1004.3308","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c3b07f7cf64e94c09928d598e29ba7a24c1af318d2bde35e1b2f8d6fd7c512f9","sha256:a27f79a7ff2dd9a7c9e4b5642427af8f7cc70fa4b077a124392358f5262bc73f"],"state_sha256":"afd629f692782b16d84c9120b231b57d33c1d41ab762338643f399956c170911"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QOcYrmJqa9ZJACPkMVpBz51HOQbaP6TFh9o4xaZmfSR/XfshG+3oe4tsEutk1DkJQZa5ZuaKxgKyWUnoi031CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T21:12:53.614835Z","bundle_sha256":"8137c2522a889a487c0620b50a4954c25474b09da646c50961d598580d70c1ac"}}