{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:JWDFYW5H4R364LJARVEPOBEJLX","short_pith_number":"pith:JWDFYW5H","canonical_record":{"source":{"id":"1512.00649","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-12-02T11:07:31Z","cross_cats_sorted":[],"title_canon_sha256":"f425d67e736f85e59deffae9ead3baf01e9e4f3c1b5ad0e13f0ef135709a4487","abstract_canon_sha256":"adf2b7e3cdbf0952feb290fbb927c28d64dfb1bde4ab48250c40dc82b695a548"},"schema_version":"1.0"},"canonical_sha256":"4d865c5ba7e477ee2d208d48f704895df0f28ef37209f99e10001f408e552ebe","source":{"kind":"arxiv","id":"1512.00649","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.00649","created_at":"2026-05-18T01:22:32Z"},{"alias_kind":"arxiv_version","alias_value":"1512.00649v1","created_at":"2026-05-18T01:22:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.00649","created_at":"2026-05-18T01:22:32Z"},{"alias_kind":"pith_short_12","alias_value":"JWDFYW5H4R36","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"JWDFYW5H4R364LJA","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"JWDFYW5H","created_at":"2026-05-18T12:29:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:JWDFYW5H4R364LJARVEPOBEJLX","target":"record","payload":{"canonical_record":{"source":{"id":"1512.00649","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-12-02T11:07:31Z","cross_cats_sorted":[],"title_canon_sha256":"f425d67e736f85e59deffae9ead3baf01e9e4f3c1b5ad0e13f0ef135709a4487","abstract_canon_sha256":"adf2b7e3cdbf0952feb290fbb927c28d64dfb1bde4ab48250c40dc82b695a548"},"schema_version":"1.0"},"canonical_sha256":"4d865c5ba7e477ee2d208d48f704895df0f28ef37209f99e10001f408e552ebe","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:22:32.633560Z","signature_b64":"BHEi7FAewq6ABsp9+K1JfadguoifrpUBj8yvc1C097CdNWxCFgEA+0OjdGpivdFW+DkQsnIp+c5xDFygZkTnAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4d865c5ba7e477ee2d208d48f704895df0f28ef37209f99e10001f408e552ebe","last_reissued_at":"2026-05-18T01:22:32.632980Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:22:32.632980Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1512.00649","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":"2026-05-18T01:22:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MRrHPA3P/4Rn0cpxyjDv3BFLumojbemderI2stg6XsEEbL9gemG4l/zUiOMS2laRWbtqIiMQF0KGhrOKsA+lBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T00:35:39.360107Z"},"content_sha256":"bad60a467b9a1a2dbe0a218c74606d17e3eaaed1b0d53fdc4d896aec92600799","schema_version":"1.0","event_id":"sha256:bad60a467b9a1a2dbe0a218c74606d17e3eaaed1b0d53fdc4d896aec92600799"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:JWDFYW5H4R364LJARVEPOBEJLX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Weighing stars: the identification of an Evolved Blue Straggler Star in the globular cluster 47 Tucanae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"2, (2) INAF-Bologna, 3) ((1) DIFA, (3) Kapteyn Astronomical Institute, A. Mucciarelli (1), B. Lanzoni (1), C. Pallanca (1), D. Massari (1, E. Dalessandro (1), E. Lapenna (1), F.R. Ferraro (1), Groningen), Univ. Bologna","submitted_at":"2015-12-02T11:07:31Z","abstract_excerpt":"Globular clusters are known to host peculiar objects, named Blue Straggler Stars (BSSs), significantly heavier than the normal stellar population. While these stars can be easily identified during their core hydrogen-burning phase, they are photometrically indistinguishable from their low-mass sisters in advanced stages of the subsequent evolution. A clear-cut identification of these objects would require the direct measurement of the stellar mass. We used the detailed comparison between chemical abundances derived from neutral and from ionized spectral lines as a powerful stellar \"weighing de"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.00649","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":"2026-05-18T01:22:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+Vi9UCMI1qCtAr8BA706scQEBGB0RjMjHBMavSusmTYfLdV6JtSp1eyKb+Ge1LH+x8bVIYpagt4Pst0+kvMMAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T00:35:39.360813Z"},"content_sha256":"d71e581e12a1d39985730e9b2903a0864c808f5af1f35b1fdd8e501e20ea201e","schema_version":"1.0","event_id":"sha256:d71e581e12a1d39985730e9b2903a0864c808f5af1f35b1fdd8e501e20ea201e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JWDFYW5H4R364LJARVEPOBEJLX/bundle.json","state_url":"https://pith.science/pith/JWDFYW5H4R364LJARVEPOBEJLX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JWDFYW5H4R364LJARVEPOBEJLX/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":"2026-05-27T00:35:39Z","links":{"resolver":"https://pith.science/pith/JWDFYW5H4R364LJARVEPOBEJLX","bundle":"https://pith.science/pith/JWDFYW5H4R364LJARVEPOBEJLX/bundle.json","state":"https://pith.science/pith/JWDFYW5H4R364LJARVEPOBEJLX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JWDFYW5H4R364LJARVEPOBEJLX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:JWDFYW5H4R364LJARVEPOBEJLX","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":"adf2b7e3cdbf0952feb290fbb927c28d64dfb1bde4ab48250c40dc82b695a548","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-12-02T11:07:31Z","title_canon_sha256":"f425d67e736f85e59deffae9ead3baf01e9e4f3c1b5ad0e13f0ef135709a4487"},"schema_version":"1.0","source":{"id":"1512.00649","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.00649","created_at":"2026-05-18T01:22:32Z"},{"alias_kind":"arxiv_version","alias_value":"1512.00649v1","created_at":"2026-05-18T01:22:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.00649","created_at":"2026-05-18T01:22:32Z"},{"alias_kind":"pith_short_12","alias_value":"JWDFYW5H4R36","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"JWDFYW5H4R364LJA","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"JWDFYW5H","created_at":"2026-05-18T12:29:27Z"}],"graph_snapshots":[{"event_id":"sha256:d71e581e12a1d39985730e9b2903a0864c808f5af1f35b1fdd8e501e20ea201e","target":"graph","created_at":"2026-05-18T01:22:32Z","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":"Globular clusters are known to host peculiar objects, named Blue Straggler Stars (BSSs), significantly heavier than the normal stellar population. While these stars can be easily identified during their core hydrogen-burning phase, they are photometrically indistinguishable from their low-mass sisters in advanced stages of the subsequent evolution. A clear-cut identification of these objects would require the direct measurement of the stellar mass. We used the detailed comparison between chemical abundances derived from neutral and from ionized spectral lines as a powerful stellar \"weighing de","authors_text":"2, (2) INAF-Bologna, 3) ((1) DIFA, (3) Kapteyn Astronomical Institute, A. Mucciarelli (1), B. Lanzoni (1), C. Pallanca (1), D. Massari (1, E. Dalessandro (1), E. Lapenna (1), F.R. Ferraro (1), Groningen), Univ. Bologna","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-12-02T11:07:31Z","title":"Weighing stars: the identification of an Evolved Blue Straggler Star in the globular cluster 47 Tucanae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.00649","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:bad60a467b9a1a2dbe0a218c74606d17e3eaaed1b0d53fdc4d896aec92600799","target":"record","created_at":"2026-05-18T01:22:32Z","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":"adf2b7e3cdbf0952feb290fbb927c28d64dfb1bde4ab48250c40dc82b695a548","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-12-02T11:07:31Z","title_canon_sha256":"f425d67e736f85e59deffae9ead3baf01e9e4f3c1b5ad0e13f0ef135709a4487"},"schema_version":"1.0","source":{"id":"1512.00649","kind":"arxiv","version":1}},"canonical_sha256":"4d865c5ba7e477ee2d208d48f704895df0f28ef37209f99e10001f408e552ebe","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4d865c5ba7e477ee2d208d48f704895df0f28ef37209f99e10001f408e552ebe","first_computed_at":"2026-05-18T01:22:32.632980Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:22:32.632980Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BHEi7FAewq6ABsp9+K1JfadguoifrpUBj8yvc1C097CdNWxCFgEA+0OjdGpivdFW+DkQsnIp+c5xDFygZkTnAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:22:32.633560Z","signed_message":"canonical_sha256_bytes"},"source_id":"1512.00649","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bad60a467b9a1a2dbe0a218c74606d17e3eaaed1b0d53fdc4d896aec92600799","sha256:d71e581e12a1d39985730e9b2903a0864c808f5af1f35b1fdd8e501e20ea201e"],"state_sha256":"93ce128e1cf0435f6ff82f28c9d2c405b7193b7df033b26b8d6a6595e345b78c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"maKn8OSSx+YN2sV9wydlGXOZu5BhzQVHRV65G+oCloGycIsbrbSZGZVMhnJcejDtCaBPFwSPkGWIT4dS8tlVDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T00:35:39.364427Z","bundle_sha256":"72df935339cefc2f413269649cf5be8d10ae36bbad715079b483ca15f3518b00"}}