{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:NAPJNNZO3M4Q2NJJAULJPIEQMN","short_pith_number":"pith:NAPJNNZO","canonical_record":{"source":{"id":"1401.7109","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-01-28T08:21:05Z","cross_cats_sorted":[],"title_canon_sha256":"ed4215b429e4ba7025b83f93df63957a689102cc2b1c7c6018935054f1004698","abstract_canon_sha256":"b3d4a93124d6c21dd2770cf6c7bf53b4c2e3e196ecd7d98aacbb2d8cccf619a8"},"schema_version":"1.0"},"canonical_sha256":"681e96b72edb390d3529051697a09063577d2044f97dce4761c352563948e739","source":{"kind":"arxiv","id":"1401.7109","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.7109","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"arxiv_version","alias_value":"1401.7109v1","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.7109","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"pith_short_12","alias_value":"NAPJNNZO3M4Q","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_16","alias_value":"NAPJNNZO3M4Q2NJJ","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_8","alias_value":"NAPJNNZO","created_at":"2026-05-18T12:28:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:NAPJNNZO3M4Q2NJJAULJPIEQMN","target":"record","payload":{"canonical_record":{"source":{"id":"1401.7109","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-01-28T08:21:05Z","cross_cats_sorted":[],"title_canon_sha256":"ed4215b429e4ba7025b83f93df63957a689102cc2b1c7c6018935054f1004698","abstract_canon_sha256":"b3d4a93124d6c21dd2770cf6c7bf53b4c2e3e196ecd7d98aacbb2d8cccf619a8"},"schema_version":"1.0"},"canonical_sha256":"681e96b72edb390d3529051697a09063577d2044f97dce4761c352563948e739","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:57:07.374657Z","signature_b64":"h1mKB/Gc2k4d1D324xHxFr5xupFANo6zMuGXiKRvES6J/wl9OnlW+Mh9lHb1K8RimaAwXZgEaFcIqm/de6ZWCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"681e96b72edb390d3529051697a09063577d2044f97dce4761c352563948e739","last_reissued_at":"2026-05-18T02:57:07.374163Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:57:07.374163Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1401.7109","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":"2026-05-18T02:57:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WsRWiT14DzMFCwWuhaEs3lPDBzbXq0OAgb5QFtfNxuSg2/MRpjagf6pKjEBE4fphLO/UHEUVvFpzuudXGgZfDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T17:59:12.429124Z"},"content_sha256":"dae88ff2e40a9e76fde8b6a8d3ce7ce2077aeb050b2e528e0646e907aa478a1f","schema_version":"1.0","event_id":"sha256:dae88ff2e40a9e76fde8b6a8d3ce7ce2077aeb050b2e528e0646e907aa478a1f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:NAPJNNZO3M4Q2NJJAULJPIEQMN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Na-O anticorrelation in horizontal branch stars. IV. M22","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Bragaglia, A. Sollima, E. Carretta, M. Salaris, R.G. Gratton, S. Cassisi, S. Lucatello, V. D'Orazi, Y. Momany","submitted_at":"2014-01-28T08:21:05Z","abstract_excerpt":"We obtained high-resolution spectra for 94 candidate stars belonging to the HB of M22 with FLAMES. The HB stars we observed span a restricted temperature range (7,800<Teff<11,000 K), where about 60% of the HB stars of M22 are. Within our sample, we can distinguish three groups of stars segregated (though contiguous) in colours: Group 1 (49 stars) is metal-poor, N-normal, Na-poor and O-rich with abundances that match those determined for the primordial group of RGB stars from previous studies. Group 2 (23 stars) is still metal-poor, but it is N- and Na-rich, though only very mildly depleted in "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.7109","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":"2026-05-18T02:57:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4KzGpCj6ifZxzgW9DyKsoJy0pjD9uwYN/ULbrXsKXW1wGdzB+umotfpGzYS8TqPH/cKZbrIKJlzhzgXm5iNADg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T17:59:12.429606Z"},"content_sha256":"bfe98acd73a6fd8cf612f741aa01694cdecd88f8474b7136f006d15f2de5b545","schema_version":"1.0","event_id":"sha256:bfe98acd73a6fd8cf612f741aa01694cdecd88f8474b7136f006d15f2de5b545"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NAPJNNZO3M4Q2NJJAULJPIEQMN/bundle.json","state_url":"https://pith.science/pith/NAPJNNZO3M4Q2NJJAULJPIEQMN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NAPJNNZO3M4Q2NJJAULJPIEQMN/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":"2026-05-29T17:59:12Z","links":{"resolver":"https://pith.science/pith/NAPJNNZO3M4Q2NJJAULJPIEQMN","bundle":"https://pith.science/pith/NAPJNNZO3M4Q2NJJAULJPIEQMN/bundle.json","state":"https://pith.science/pith/NAPJNNZO3M4Q2NJJAULJPIEQMN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NAPJNNZO3M4Q2NJJAULJPIEQMN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:NAPJNNZO3M4Q2NJJAULJPIEQMN","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":"b3d4a93124d6c21dd2770cf6c7bf53b4c2e3e196ecd7d98aacbb2d8cccf619a8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-01-28T08:21:05Z","title_canon_sha256":"ed4215b429e4ba7025b83f93df63957a689102cc2b1c7c6018935054f1004698"},"schema_version":"1.0","source":{"id":"1401.7109","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.7109","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"arxiv_version","alias_value":"1401.7109v1","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.7109","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"pith_short_12","alias_value":"NAPJNNZO3M4Q","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_16","alias_value":"NAPJNNZO3M4Q2NJJ","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_8","alias_value":"NAPJNNZO","created_at":"2026-05-18T12:28:41Z"}],"graph_snapshots":[{"event_id":"sha256:bfe98acd73a6fd8cf612f741aa01694cdecd88f8474b7136f006d15f2de5b545","target":"graph","created_at":"2026-05-18T02:57:07Z","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 obtained high-resolution spectra for 94 candidate stars belonging to the HB of M22 with FLAMES. The HB stars we observed span a restricted temperature range (7,800<Teff<11,000 K), where about 60% of the HB stars of M22 are. Within our sample, we can distinguish three groups of stars segregated (though contiguous) in colours: Group 1 (49 stars) is metal-poor, N-normal, Na-poor and O-rich with abundances that match those determined for the primordial group of RGB stars from previous studies. Group 2 (23 stars) is still metal-poor, but it is N- and Na-rich, though only very mildly depleted in ","authors_text":"A. Bragaglia, A. Sollima, E. Carretta, M. Salaris, R.G. Gratton, S. Cassisi, S. Lucatello, V. D'Orazi, Y. Momany","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-01-28T08:21:05Z","title":"The Na-O anticorrelation in horizontal branch stars. IV. M22"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.7109","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:dae88ff2e40a9e76fde8b6a8d3ce7ce2077aeb050b2e528e0646e907aa478a1f","target":"record","created_at":"2026-05-18T02:57:07Z","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":"b3d4a93124d6c21dd2770cf6c7bf53b4c2e3e196ecd7d98aacbb2d8cccf619a8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-01-28T08:21:05Z","title_canon_sha256":"ed4215b429e4ba7025b83f93df63957a689102cc2b1c7c6018935054f1004698"},"schema_version":"1.0","source":{"id":"1401.7109","kind":"arxiv","version":1}},"canonical_sha256":"681e96b72edb390d3529051697a09063577d2044f97dce4761c352563948e739","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"681e96b72edb390d3529051697a09063577d2044f97dce4761c352563948e739","first_computed_at":"2026-05-18T02:57:07.374163Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:57:07.374163Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"h1mKB/Gc2k4d1D324xHxFr5xupFANo6zMuGXiKRvES6J/wl9OnlW+Mh9lHb1K8RimaAwXZgEaFcIqm/de6ZWCg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:57:07.374657Z","signed_message":"canonical_sha256_bytes"},"source_id":"1401.7109","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dae88ff2e40a9e76fde8b6a8d3ce7ce2077aeb050b2e528e0646e907aa478a1f","sha256:bfe98acd73a6fd8cf612f741aa01694cdecd88f8474b7136f006d15f2de5b545"],"state_sha256":"0f1f5d340e4f54526cddcc0abef79c1021fb138460cbd2eecf20c19b5e90d507"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4xmQXyqAAsH99WJhPBhsG10cSUpKnYGGeDmgB02JOzpqP0kq8Ovqgv4uLuBdsPFUhanN5hpJDJ1LFJD/KYnJBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T17:59:12.433290Z","bundle_sha256":"30422744b734d0bc8142264f58895fd23c08f3ec74d257530625870570fdf28a"}}