{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:FGLAUTNBG4MNTUZMOXWD4RZVUF","short_pith_number":"pith:FGLAUTNB","canonical_record":{"source":{"id":"0806.4465","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-06-27T09:06:54Z","cross_cats_sorted":[],"title_canon_sha256":"1e3a5871b1a7cf77410760e4bef5026233545e461a73aaa85cbcf3ba193dd19b","abstract_canon_sha256":"076fe0f6022bf4e3721ce01c9d053ce53843e2ddf0f963e7d2eafe627f1ecc55"},"schema_version":"1.0"},"canonical_sha256":"29960a4da13718d9d32c75ec3e4735a1506be0603519ea578921d8522822f0ca","source":{"kind":"arxiv","id":"0806.4465","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0806.4465","created_at":"2026-07-04T17:11:33Z"},{"alias_kind":"arxiv_version","alias_value":"0806.4465v1","created_at":"2026-07-04T17:11:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0806.4465","created_at":"2026-07-04T17:11:33Z"},{"alias_kind":"pith_short_12","alias_value":"FGLAUTNBG4MN","created_at":"2026-07-04T17:11:33Z"},{"alias_kind":"pith_short_16","alias_value":"FGLAUTNBG4MNTUZM","created_at":"2026-07-04T17:11:33Z"},{"alias_kind":"pith_short_8","alias_value":"FGLAUTNB","created_at":"2026-07-04T17:11:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:FGLAUTNBG4MNTUZMOXWD4RZVUF","target":"record","payload":{"canonical_record":{"source":{"id":"0806.4465","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-06-27T09:06:54Z","cross_cats_sorted":[],"title_canon_sha256":"1e3a5871b1a7cf77410760e4bef5026233545e461a73aaa85cbcf3ba193dd19b","abstract_canon_sha256":"076fe0f6022bf4e3721ce01c9d053ce53843e2ddf0f963e7d2eafe627f1ecc55"},"schema_version":"1.0"},"canonical_sha256":"29960a4da13718d9d32c75ec3e4735a1506be0603519ea578921d8522822f0ca","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:11:33.291225Z","signature_b64":"Saek0Nll9XWmosAXYDN4QzHu5fj9nBs4hxCDRKF1ObSg1jwlMKVNzcE7DJprPbVFT3qM6N/xttW57Ao8rfYFCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"29960a4da13718d9d32c75ec3e4735a1506be0603519ea578921d8522822f0ca","last_reissued_at":"2026-07-04T17:11:33.290887Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:11:33.290887Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0806.4465","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":"2026-07-04T17:11:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e8qqLqufOQ5pSgVIzTeKCbFl/lljcPjs8q+CRTF1E7Jjj67RxbOGYRqmm/I+DzoLegW+ACQmHXM1X9FZdTDaBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T19:08:20.602327Z"},"content_sha256":"763e3673ffe174e9fca0b1c6fb4609ec574e8bbb30a130770f285cf8c2dea5f2","schema_version":"1.0","event_id":"sha256:763e3673ffe174e9fca0b1c6fb4609ec574e8bbb30a130770f285cf8c2dea5f2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:FGLAUTNBG4MNTUZMOXWD4RZVUF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Chemical Enrichment History of the Small Magellanic Cloud and Its Gradients","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Antonio Aparicio, Carme Gallart, Edgardo Costa, Noelia E. D. No\\\"el, Rene A. M\\'endez, Ricardo Carrera","submitted_at":"2008-06-27T09:06:54Z","abstract_excerpt":"We present stellar metallicities derived from Ca II triplet spectroscopy in over 350 red giant branch stars in 13 fields distributed in different positions in the SMC, ranging from $\\sim$1\\arcdeg\\@ to $\\sim$4\\arcdeg\\@ from its center. In the innermost fields the average metallicity is [Fe/H] $\\sim -1$. This value decreases when we move away towards outermost regions. This is the first detection of a metallicity gradient in this galaxy. We show that the metallicity gradient is related to an age gradient, in the sense that more metal-rich stars, which are also younger, are concentrated in the ce"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0806.4465","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0806.4465/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T17:11:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SWuZWveXoiYcxbh52yFTnUgoReFrsHl9j8rDE72FzJtgvP7WvfhDhV7pDlusR8yLY5Op59tIQ7VHgly3Z/lkCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T19:08:20.603333Z"},"content_sha256":"00ecde1c211a34568b0626a555ccd0f0ef7c63affe50b3513e4961a78a1d447b","schema_version":"1.0","event_id":"sha256:00ecde1c211a34568b0626a555ccd0f0ef7c63affe50b3513e4961a78a1d447b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FGLAUTNBG4MNTUZMOXWD4RZVUF/bundle.json","state_url":"https://pith.science/pith/FGLAUTNBG4MNTUZMOXWD4RZVUF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FGLAUTNBG4MNTUZMOXWD4RZVUF/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":"2026-08-20T19:08:20Z","links":{"resolver":"https://pith.science/pith/FGLAUTNBG4MNTUZMOXWD4RZVUF","bundle":"https://pith.science/pith/FGLAUTNBG4MNTUZMOXWD4RZVUF/bundle.json","state":"https://pith.science/pith/FGLAUTNBG4MNTUZMOXWD4RZVUF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FGLAUTNBG4MNTUZMOXWD4RZVUF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:FGLAUTNBG4MNTUZMOXWD4RZVUF","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":"076fe0f6022bf4e3721ce01c9d053ce53843e2ddf0f963e7d2eafe627f1ecc55","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-06-27T09:06:54Z","title_canon_sha256":"1e3a5871b1a7cf77410760e4bef5026233545e461a73aaa85cbcf3ba193dd19b"},"schema_version":"1.0","source":{"id":"0806.4465","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0806.4465","created_at":"2026-07-04T17:11:33Z"},{"alias_kind":"arxiv_version","alias_value":"0806.4465v1","created_at":"2026-07-04T17:11:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0806.4465","created_at":"2026-07-04T17:11:33Z"},{"alias_kind":"pith_short_12","alias_value":"FGLAUTNBG4MN","created_at":"2026-07-04T17:11:33Z"},{"alias_kind":"pith_short_16","alias_value":"FGLAUTNBG4MNTUZM","created_at":"2026-07-04T17:11:33Z"},{"alias_kind":"pith_short_8","alias_value":"FGLAUTNB","created_at":"2026-07-04T17:11:33Z"}],"graph_snapshots":[{"event_id":"sha256:00ecde1c211a34568b0626a555ccd0f0ef7c63affe50b3513e4961a78a1d447b","target":"graph","created_at":"2026-07-04T17:11:33Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/0806.4465/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present stellar metallicities derived from Ca II triplet spectroscopy in over 350 red giant branch stars in 13 fields distributed in different positions in the SMC, ranging from $\\sim$1\\arcdeg\\@ to $\\sim$4\\arcdeg\\@ from its center. In the innermost fields the average metallicity is [Fe/H] $\\sim -1$. This value decreases when we move away towards outermost regions. This is the first detection of a metallicity gradient in this galaxy. We show that the metallicity gradient is related to an age gradient, in the sense that more metal-rich stars, which are also younger, are concentrated in the ce","authors_text":"Antonio Aparicio, Carme Gallart, Edgardo Costa, Noelia E. D. No\\\"el, Rene A. M\\'endez, Ricardo Carrera","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-06-27T09:06:54Z","title":"The Chemical Enrichment History of the Small Magellanic Cloud and Its Gradients"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0806.4465","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":"sha256:763e3673ffe174e9fca0b1c6fb4609ec574e8bbb30a130770f285cf8c2dea5f2","target":"record","created_at":"2026-07-04T17:11:33Z","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":"076fe0f6022bf4e3721ce01c9d053ce53843e2ddf0f963e7d2eafe627f1ecc55","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-06-27T09:06:54Z","title_canon_sha256":"1e3a5871b1a7cf77410760e4bef5026233545e461a73aaa85cbcf3ba193dd19b"},"schema_version":"1.0","source":{"id":"0806.4465","kind":"arxiv","version":1}},"canonical_sha256":"29960a4da13718d9d32c75ec3e4735a1506be0603519ea578921d8522822f0ca","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"29960a4da13718d9d32c75ec3e4735a1506be0603519ea578921d8522822f0ca","first_computed_at":"2026-07-04T17:11:33.290887Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:11:33.290887Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Saek0Nll9XWmosAXYDN4QzHu5fj9nBs4hxCDRKF1ObSg1jwlMKVNzcE7DJprPbVFT3qM6N/xttW57Ao8rfYFCA==","signature_status":"signed_v1","signed_at":"2026-07-04T17:11:33.291225Z","signed_message":"canonical_sha256_bytes"},"source_id":"0806.4465","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:763e3673ffe174e9fca0b1c6fb4609ec574e8bbb30a130770f285cf8c2dea5f2","sha256:00ecde1c211a34568b0626a555ccd0f0ef7c63affe50b3513e4961a78a1d447b"],"state_sha256":"7c24c52b2ebd521bada982af409c270dfbab49ff110bcdb2f549d49b17271c39"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+MM6gDczpsGdUpFnrKGVONXIJMDaypKGLEcEJUscmtuRebLB6VfULhJnsY0bT3ChiMeKiCMUdWiyolo7HSOcCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T19:08:20.610690Z","bundle_sha256":"65f83a34ed48420019db1e120676a28a30c02f37531c4accc0e67a5bb5e3648f"}}