{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:KKL7CO7ZTFVHCBQIYXOOFO4PAY","short_pith_number":"pith:KKL7CO7Z","canonical_record":{"source":{"id":"1602.01897","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-02-05T00:27:01Z","cross_cats_sorted":[],"title_canon_sha256":"e2ee5ed4a2105c044ead93c8214c5eefcfa8d1e91e5ad2578bddcd09cbf484de","abstract_canon_sha256":"8f70ce8beb95e2b55e37ca7a9ab960dd697e7eab188fe42083f85d04de4719e9"},"schema_version":"1.0"},"canonical_sha256":"5297f13bf9996a710608c5dce2bb8f06229f53c9b6c6cac04014f5469cf8bc12","source":{"kind":"arxiv","id":"1602.01897","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.01897","created_at":"2026-05-18T01:21:15Z"},{"alias_kind":"arxiv_version","alias_value":"1602.01897v1","created_at":"2026-05-18T01:21:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.01897","created_at":"2026-05-18T01:21:15Z"},{"alias_kind":"pith_short_12","alias_value":"KKL7CO7ZTFVH","created_at":"2026-05-18T12:30:25Z"},{"alias_kind":"pith_short_16","alias_value":"KKL7CO7ZTFVHCBQI","created_at":"2026-05-18T12:30:25Z"},{"alias_kind":"pith_short_8","alias_value":"KKL7CO7Z","created_at":"2026-05-18T12:30:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:KKL7CO7ZTFVHCBQIYXOOFO4PAY","target":"record","payload":{"canonical_record":{"source":{"id":"1602.01897","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-02-05T00:27:01Z","cross_cats_sorted":[],"title_canon_sha256":"e2ee5ed4a2105c044ead93c8214c5eefcfa8d1e91e5ad2578bddcd09cbf484de","abstract_canon_sha256":"8f70ce8beb95e2b55e37ca7a9ab960dd697e7eab188fe42083f85d04de4719e9"},"schema_version":"1.0"},"canonical_sha256":"5297f13bf9996a710608c5dce2bb8f06229f53c9b6c6cac04014f5469cf8bc12","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:21:15.118373Z","signature_b64":"hLSk+b6xt0V3MXZX5/fOFCsI5Y+aa/1DE2BkNhF4L7NisxXt3Yj9NS5nl+5HLZT7WxDWQ2TFVdc8Jq6arr1pDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5297f13bf9996a710608c5dce2bb8f06229f53c9b6c6cac04014f5469cf8bc12","last_reissued_at":"2026-05-18T01:21:15.117778Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:21:15.117778Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1602.01897","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":"2026-05-18T01:21:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YwUbzubFcr7GA0HaBqC3ZKb/qP898Iqipm8sgLEzbg63jVVuRIkFMwhxd+7+sysY42LxL6slKaysDO4udIHZDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T13:20:05.920364Z"},"content_sha256":"ad3ad2ef822ba963b43de6789c910e0c4b780926274ed3be86812961fff72e32","schema_version":"1.0","event_id":"sha256:ad3ad2ef822ba963b43de6789c910e0c4b780926274ed3be86812961fff72e32"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:KKL7CO7ZTFVHCBQIYXOOFO4PAY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ca II triplet spectroscopy of RGB stars in NGC 6822: kinematics and metallicities","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Andrew A. Cole, Eline Tolstoy, Jesse Swan, Mike J. Irwin","submitted_at":"2016-02-05T00:27:01Z","abstract_excerpt":"We present a detailed analysis of the chemistry and kinematics of red giants in the dwarf irregular galaxy NGC 6822. Spectroscopy at 8500 Angstroms was acquired for 72 red giant stars across two fields using FORS2 at the VLT. Line of sight extinction was individually estimated for each target star to accommodate the variable reddening across NGC 6822. The mean radial velocity was found to be v_helio = (52.8 +/- 2.2) km/s with dispersion rms = 24.1 km/s, in agreement with other studies. Ca II triplet equivalent widths were converted into [Fe/H] metallicities using a V magnitude proxy for surfac"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.01897","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":"2026-05-18T01:21:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"h4nuKiHp4Pf9QSekLPGxKxcI1eyvDJJktHMvBjRfA+4NjAYSiILKLnQH8xUXIIQcC+PzKmPf02uHK7nqWTWeBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T13:20:05.920722Z"},"content_sha256":"fc4f16b8d825f23f12cb12010eef6e5772443ecd9f22504ab98396c2b58aff52","schema_version":"1.0","event_id":"sha256:fc4f16b8d825f23f12cb12010eef6e5772443ecd9f22504ab98396c2b58aff52"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KKL7CO7ZTFVHCBQIYXOOFO4PAY/bundle.json","state_url":"https://pith.science/pith/KKL7CO7ZTFVHCBQIYXOOFO4PAY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KKL7CO7ZTFVHCBQIYXOOFO4PAY/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":"2026-06-05T13:20:05Z","links":{"resolver":"https://pith.science/pith/KKL7CO7ZTFVHCBQIYXOOFO4PAY","bundle":"https://pith.science/pith/KKL7CO7ZTFVHCBQIYXOOFO4PAY/bundle.json","state":"https://pith.science/pith/KKL7CO7ZTFVHCBQIYXOOFO4PAY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KKL7CO7ZTFVHCBQIYXOOFO4PAY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:KKL7CO7ZTFVHCBQIYXOOFO4PAY","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":"8f70ce8beb95e2b55e37ca7a9ab960dd697e7eab188fe42083f85d04de4719e9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-02-05T00:27:01Z","title_canon_sha256":"e2ee5ed4a2105c044ead93c8214c5eefcfa8d1e91e5ad2578bddcd09cbf484de"},"schema_version":"1.0","source":{"id":"1602.01897","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.01897","created_at":"2026-05-18T01:21:15Z"},{"alias_kind":"arxiv_version","alias_value":"1602.01897v1","created_at":"2026-05-18T01:21:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.01897","created_at":"2026-05-18T01:21:15Z"},{"alias_kind":"pith_short_12","alias_value":"KKL7CO7ZTFVH","created_at":"2026-05-18T12:30:25Z"},{"alias_kind":"pith_short_16","alias_value":"KKL7CO7ZTFVHCBQI","created_at":"2026-05-18T12:30:25Z"},{"alias_kind":"pith_short_8","alias_value":"KKL7CO7Z","created_at":"2026-05-18T12:30:25Z"}],"graph_snapshots":[{"event_id":"sha256:fc4f16b8d825f23f12cb12010eef6e5772443ecd9f22504ab98396c2b58aff52","target":"graph","created_at":"2026-05-18T01:21:15Z","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 a detailed analysis of the chemistry and kinematics of red giants in the dwarf irregular galaxy NGC 6822. Spectroscopy at 8500 Angstroms was acquired for 72 red giant stars across two fields using FORS2 at the VLT. Line of sight extinction was individually estimated for each target star to accommodate the variable reddening across NGC 6822. The mean radial velocity was found to be v_helio = (52.8 +/- 2.2) km/s with dispersion rms = 24.1 km/s, in agreement with other studies. Ca II triplet equivalent widths were converted into [Fe/H] metallicities using a V magnitude proxy for surfac","authors_text":"Andrew A. Cole, Eline Tolstoy, Jesse Swan, Mike J. Irwin","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-02-05T00:27:01Z","title":"Ca II triplet spectroscopy of RGB stars in NGC 6822: kinematics and metallicities"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.01897","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:ad3ad2ef822ba963b43de6789c910e0c4b780926274ed3be86812961fff72e32","target":"record","created_at":"2026-05-18T01:21:15Z","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":"8f70ce8beb95e2b55e37ca7a9ab960dd697e7eab188fe42083f85d04de4719e9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-02-05T00:27:01Z","title_canon_sha256":"e2ee5ed4a2105c044ead93c8214c5eefcfa8d1e91e5ad2578bddcd09cbf484de"},"schema_version":"1.0","source":{"id":"1602.01897","kind":"arxiv","version":1}},"canonical_sha256":"5297f13bf9996a710608c5dce2bb8f06229f53c9b6c6cac04014f5469cf8bc12","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5297f13bf9996a710608c5dce2bb8f06229f53c9b6c6cac04014f5469cf8bc12","first_computed_at":"2026-05-18T01:21:15.117778Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:21:15.117778Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hLSk+b6xt0V3MXZX5/fOFCsI5Y+aa/1DE2BkNhF4L7NisxXt3Yj9NS5nl+5HLZT7WxDWQ2TFVdc8Jq6arr1pDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:21:15.118373Z","signed_message":"canonical_sha256_bytes"},"source_id":"1602.01897","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ad3ad2ef822ba963b43de6789c910e0c4b780926274ed3be86812961fff72e32","sha256:fc4f16b8d825f23f12cb12010eef6e5772443ecd9f22504ab98396c2b58aff52"],"state_sha256":"fa6199a1da6c81cc1f36b988fc0ee80eb28f3e5149892b4c1db0663763b00849"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nYn/ayr9muJM8JAlVTy8C/ZiCSv17bMSoI1GshqY3EahmQvAVCS6DQe9GAVMTszkftvLkE/U2Uq32XNTfuk2AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T13:20:05.922591Z","bundle_sha256":"89137a577742cf30c6af2d6ae5ae04acafa661d6e1340ba571bf959849c8dff7"}}