{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:42WLFOEO4ZGPQUNPCQEGZ5763G","short_pith_number":"pith:42WLFOEO","canonical_record":{"source":{"id":"1610.01834","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-10-06T12:09:15Z","cross_cats_sorted":[],"title_canon_sha256":"248662f85180c4d5800bcacacd851aa03633c8e97a662a6a050309fd64aa1c69","abstract_canon_sha256":"5b78c8394340a55053a513ae23ee98eceb27686d5fa84d9222877728f0d31549"},"schema_version":"1.0"},"canonical_sha256":"e6acb2b88ee64cf851af14086cf7fed9bd486f1154b867bc792f5663c4a567fc","source":{"kind":"arxiv","id":"1610.01834","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.01834","created_at":"2026-05-18T01:02:36Z"},{"alias_kind":"arxiv_version","alias_value":"1610.01834v1","created_at":"2026-05-18T01:02:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.01834","created_at":"2026-05-18T01:02:36Z"},{"alias_kind":"pith_short_12","alias_value":"42WLFOEO4ZGP","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"42WLFOEO4ZGPQUNP","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"42WLFOEO","created_at":"2026-05-18T12:29:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:42WLFOEO4ZGPQUNPCQEGZ5763G","target":"record","payload":{"canonical_record":{"source":{"id":"1610.01834","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-10-06T12:09:15Z","cross_cats_sorted":[],"title_canon_sha256":"248662f85180c4d5800bcacacd851aa03633c8e97a662a6a050309fd64aa1c69","abstract_canon_sha256":"5b78c8394340a55053a513ae23ee98eceb27686d5fa84d9222877728f0d31549"},"schema_version":"1.0"},"canonical_sha256":"e6acb2b88ee64cf851af14086cf7fed9bd486f1154b867bc792f5663c4a567fc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:02:36.058189Z","signature_b64":"5AYev0djklzF+ud8GTq+WaCXufZBJesSxLod5eCKq2unTXfOirDhrl8mJQl8QqMHNCa4JoUeKSbPjrTeXN4ECQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e6acb2b88ee64cf851af14086cf7fed9bd486f1154b867bc792f5663c4a567fc","last_reissued_at":"2026-05-18T01:02:36.057448Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:02:36.057448Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.01834","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":"2026-05-18T01:02:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WtGjtg5qMXG+bWURLFRQ+j6Ue6f+9gTfzlBDlfsgsi7Aq4s5ifMf9A2HK9BaskXQfeCmrLZRTZl22JgfjJz0Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T12:11:15.298694Z"},"content_sha256":"1be4ac3725bb3562b1accb48f1580a6285235c54768606354f26bfd99e4f58aa","schema_version":"1.0","event_id":"sha256:1be4ac3725bb3562b1accb48f1580a6285235c54768606354f26bfd99e4f58aa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:42WLFOEO4ZGPQUNPCQEGZ5763G","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A spectroscopic study of the Globular Cluster M28 (NGC~6626)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"C. Moni Bidin, C. Munoz, F. Mauro, L. Monaco, S. Villanova","submitted_at":"2016-10-06T12:09:15Z","abstract_excerpt":"We present the abundance analysis for a sample of 17 red giant branch stars in the metal-poor globular cluster M28 based on high resolution spectra. This is the first extensive spectroscopic study of this cluster. We derive abundances of O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Ba, La, Ce, and Eu. We find a metallicity of [Fe/H]=-1.29+-0.01 and an alpha-enhancement of +0.34+-0.01 (errors on the mean), typical of Halo Globular Clusters in this metallicity regime. A large spread is observed in the abundances of light elements O, Na, and Al. Mg also shows an anticorrelatio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.01834","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":"2026-05-18T01:02:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rO8BdRE70vsTaTUAePcCepNxVbtfaQBx1+cbh9aPi9p+zY54NamJyVWM/2NCpmHuZWRrQ8BMidaZKoIsp0fSAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T12:11:15.299052Z"},"content_sha256":"4b1f2f0668ec079d1a93894e7e2f44f6d9cf36931dc32e90652e76bc2e8bc4cb","schema_version":"1.0","event_id":"sha256:4b1f2f0668ec079d1a93894e7e2f44f6d9cf36931dc32e90652e76bc2e8bc4cb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/42WLFOEO4ZGPQUNPCQEGZ5763G/bundle.json","state_url":"https://pith.science/pith/42WLFOEO4ZGPQUNPCQEGZ5763G/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/42WLFOEO4ZGPQUNPCQEGZ5763G/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":"2026-06-05T12:11:15Z","links":{"resolver":"https://pith.science/pith/42WLFOEO4ZGPQUNPCQEGZ5763G","bundle":"https://pith.science/pith/42WLFOEO4ZGPQUNPCQEGZ5763G/bundle.json","state":"https://pith.science/pith/42WLFOEO4ZGPQUNPCQEGZ5763G/state.json","well_known_bundle":"https://pith.science/.well-known/pith/42WLFOEO4ZGPQUNPCQEGZ5763G/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:42WLFOEO4ZGPQUNPCQEGZ5763G","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":"5b78c8394340a55053a513ae23ee98eceb27686d5fa84d9222877728f0d31549","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-10-06T12:09:15Z","title_canon_sha256":"248662f85180c4d5800bcacacd851aa03633c8e97a662a6a050309fd64aa1c69"},"schema_version":"1.0","source":{"id":"1610.01834","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.01834","created_at":"2026-05-18T01:02:36Z"},{"alias_kind":"arxiv_version","alias_value":"1610.01834v1","created_at":"2026-05-18T01:02:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.01834","created_at":"2026-05-18T01:02:36Z"},{"alias_kind":"pith_short_12","alias_value":"42WLFOEO4ZGP","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"42WLFOEO4ZGPQUNP","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"42WLFOEO","created_at":"2026-05-18T12:29:58Z"}],"graph_snapshots":[{"event_id":"sha256:4b1f2f0668ec079d1a93894e7e2f44f6d9cf36931dc32e90652e76bc2e8bc4cb","target":"graph","created_at":"2026-05-18T01:02:36Z","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 the abundance analysis for a sample of 17 red giant branch stars in the metal-poor globular cluster M28 based on high resolution spectra. This is the first extensive spectroscopic study of this cluster. We derive abundances of O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Ba, La, Ce, and Eu. We find a metallicity of [Fe/H]=-1.29+-0.01 and an alpha-enhancement of +0.34+-0.01 (errors on the mean), typical of Halo Globular Clusters in this metallicity regime. A large spread is observed in the abundances of light elements O, Na, and Al. Mg also shows an anticorrelatio","authors_text":"C. Moni Bidin, C. Munoz, F. Mauro, L. Monaco, S. Villanova","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-10-06T12:09:15Z","title":"A spectroscopic study of the Globular Cluster M28 (NGC~6626)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.01834","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":"sha256:1be4ac3725bb3562b1accb48f1580a6285235c54768606354f26bfd99e4f58aa","target":"record","created_at":"2026-05-18T01:02:36Z","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":"5b78c8394340a55053a513ae23ee98eceb27686d5fa84d9222877728f0d31549","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-10-06T12:09:15Z","title_canon_sha256":"248662f85180c4d5800bcacacd851aa03633c8e97a662a6a050309fd64aa1c69"},"schema_version":"1.0","source":{"id":"1610.01834","kind":"arxiv","version":1}},"canonical_sha256":"e6acb2b88ee64cf851af14086cf7fed9bd486f1154b867bc792f5663c4a567fc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e6acb2b88ee64cf851af14086cf7fed9bd486f1154b867bc792f5663c4a567fc","first_computed_at":"2026-05-18T01:02:36.057448Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:02:36.057448Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5AYev0djklzF+ud8GTq+WaCXufZBJesSxLod5eCKq2unTXfOirDhrl8mJQl8QqMHNCa4JoUeKSbPjrTeXN4ECQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:02:36.058189Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.01834","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1be4ac3725bb3562b1accb48f1580a6285235c54768606354f26bfd99e4f58aa","sha256:4b1f2f0668ec079d1a93894e7e2f44f6d9cf36931dc32e90652e76bc2e8bc4cb"],"state_sha256":"aca4cabb01a8652def7dab4dd3167aaf7eca32cb6b429840d76f8c59d1237249"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DCbFI7vF+3SFhKHMTIj7xGHvC70qbIuPxNDK2qLfonfsvoHCLgAQps7V4pmCDV8ecb2FTgsIoYJabURcZtUaBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T12:11:15.301225Z","bundle_sha256":"ff7bc0545ca1e3bb3c4fac6b106fa779c8908031dc74885982e561ab12b4ea6b"}}