{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:VO4BL37UBAOX7H7ZZJZEOKK2DX","short_pith_number":"pith:VO4BL37U","canonical_record":{"source":{"id":"1906.10830","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-06-26T03:50:32Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"73f9c06fbdb15598271a3640b2d132eea213ab83973a4b28f4ba49435ba0890b","abstract_canon_sha256":"09fefc625feb1d6487a7cc5a43bfddd41bd7cb195e972bede299d1f30f4edc48"},"schema_version":"1.0"},"canonical_sha256":"abb815eff4081d7f9ff9ca7247295a1dff57f22c3a9052a537336047c4efdf31","source":{"kind":"arxiv","id":"1906.10830","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.10830","created_at":"2026-05-17T23:42:13Z"},{"alias_kind":"arxiv_version","alias_value":"1906.10830v1","created_at":"2026-05-17T23:42:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.10830","created_at":"2026-05-17T23:42:13Z"},{"alias_kind":"pith_short_12","alias_value":"VO4BL37UBAOX","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"VO4BL37UBAOX7H7Z","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"VO4BL37U","created_at":"2026-05-18T12:33:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:VO4BL37UBAOX7H7ZZJZEOKK2DX","target":"record","payload":{"canonical_record":{"source":{"id":"1906.10830","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-06-26T03:50:32Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"73f9c06fbdb15598271a3640b2d132eea213ab83973a4b28f4ba49435ba0890b","abstract_canon_sha256":"09fefc625feb1d6487a7cc5a43bfddd41bd7cb195e972bede299d1f30f4edc48"},"schema_version":"1.0"},"canonical_sha256":"abb815eff4081d7f9ff9ca7247295a1dff57f22c3a9052a537336047c4efdf31","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:42:13.123742Z","signature_b64":"TnU3KDxjqNPd4iZ3ztn7kulqWqmP602Etn1VqmyMxfHTyl0CPHzDFzoic4a1Yrn0pYCk5TrM/gZUtrI2LtxECQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"abb815eff4081d7f9ff9ca7247295a1dff57f22c3a9052a537336047c4efdf31","last_reissued_at":"2026-05-17T23:42:13.122946Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:42:13.122946Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1906.10830","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":"2026-05-17T23:42:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"onoDuv33aoybl77JeUfSqOBgulPdHolCOp1sbXcXTwmUo6863ywoKJ2bF8Ub3liaeG+rYzIphyZUQ1SGJYivBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T03:57:31.948232Z"},"content_sha256":"bd1e34878e20c291dcbecffc5fd73cbe1c65cfc3f996b07d12a257f97f63793d","schema_version":"1.0","event_id":"sha256:bd1e34878e20c291dcbecffc5fd73cbe1c65cfc3f996b07d12a257f97f63793d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:VO4BL37UBAOX7H7ZZJZEOKK2DX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Origin of $\\alpha$-rich young stars: clues from C, N and O","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Jennifer A. Johnson, Saskia Hekker","submitted_at":"2019-06-26T03:50:32Z","abstract_excerpt":"A small set of chemically old stars that appear young by their independently derived masses has been detected. These are so-called $\\alpha$-rich young stars. For a sample of 51 red-giant stars, for which spectra are available from SDSS/APOGEE and masses are available from asteroseismic measures based on \\textit{Kepler} lightcurves, we derive the C, N and O abundances through an independent analysis. These stars span a wide range of N/C surface number density ratios. We interpret the high-mass stars with low N/C as being products of mergers or mass transfer during or after first dredge up, beca"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.10830","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":"2026-05-17T23:42:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0lAe1X/g42wTPZ4HdUg7xh4Xm9NEVPP0dtiTqML1aEP7UDF9BDUDLIPF5Ci/cW9c+wezAbwxriezPNg8penBAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T03:57:31.948940Z"},"content_sha256":"0be56b4f797f61ba670f484dd1b61f00c4c41e84f1e863244811727df24f1eef","schema_version":"1.0","event_id":"sha256:0be56b4f797f61ba670f484dd1b61f00c4c41e84f1e863244811727df24f1eef"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VO4BL37UBAOX7H7ZZJZEOKK2DX/bundle.json","state_url":"https://pith.science/pith/VO4BL37UBAOX7H7ZZJZEOKK2DX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VO4BL37UBAOX7H7ZZJZEOKK2DX/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":"2026-05-26T03:57:31Z","links":{"resolver":"https://pith.science/pith/VO4BL37UBAOX7H7ZZJZEOKK2DX","bundle":"https://pith.science/pith/VO4BL37UBAOX7H7ZZJZEOKK2DX/bundle.json","state":"https://pith.science/pith/VO4BL37UBAOX7H7ZZJZEOKK2DX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VO4BL37UBAOX7H7ZZJZEOKK2DX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:VO4BL37UBAOX7H7ZZJZEOKK2DX","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":"09fefc625feb1d6487a7cc5a43bfddd41bd7cb195e972bede299d1f30f4edc48","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-06-26T03:50:32Z","title_canon_sha256":"73f9c06fbdb15598271a3640b2d132eea213ab83973a4b28f4ba49435ba0890b"},"schema_version":"1.0","source":{"id":"1906.10830","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.10830","created_at":"2026-05-17T23:42:13Z"},{"alias_kind":"arxiv_version","alias_value":"1906.10830v1","created_at":"2026-05-17T23:42:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.10830","created_at":"2026-05-17T23:42:13Z"},{"alias_kind":"pith_short_12","alias_value":"VO4BL37UBAOX","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"VO4BL37UBAOX7H7Z","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"VO4BL37U","created_at":"2026-05-18T12:33:30Z"}],"graph_snapshots":[{"event_id":"sha256:0be56b4f797f61ba670f484dd1b61f00c4c41e84f1e863244811727df24f1eef","target":"graph","created_at":"2026-05-17T23:42:13Z","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":"A small set of chemically old stars that appear young by their independently derived masses has been detected. These are so-called $\\alpha$-rich young stars. For a sample of 51 red-giant stars, for which spectra are available from SDSS/APOGEE and masses are available from asteroseismic measures based on \\textit{Kepler} lightcurves, we derive the C, N and O abundances through an independent analysis. These stars span a wide range of N/C surface number density ratios. We interpret the high-mass stars with low N/C as being products of mergers or mass transfer during or after first dredge up, beca","authors_text":"Jennifer A. Johnson, Saskia Hekker","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-06-26T03:50:32Z","title":"Origin of $\\alpha$-rich young stars: clues from C, N and O"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.10830","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:bd1e34878e20c291dcbecffc5fd73cbe1c65cfc3f996b07d12a257f97f63793d","target":"record","created_at":"2026-05-17T23:42:13Z","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":"09fefc625feb1d6487a7cc5a43bfddd41bd7cb195e972bede299d1f30f4edc48","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-06-26T03:50:32Z","title_canon_sha256":"73f9c06fbdb15598271a3640b2d132eea213ab83973a4b28f4ba49435ba0890b"},"schema_version":"1.0","source":{"id":"1906.10830","kind":"arxiv","version":1}},"canonical_sha256":"abb815eff4081d7f9ff9ca7247295a1dff57f22c3a9052a537336047c4efdf31","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"abb815eff4081d7f9ff9ca7247295a1dff57f22c3a9052a537336047c4efdf31","first_computed_at":"2026-05-17T23:42:13.122946Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:42:13.122946Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TnU3KDxjqNPd4iZ3ztn7kulqWqmP602Etn1VqmyMxfHTyl0CPHzDFzoic4a1Yrn0pYCk5TrM/gZUtrI2LtxECQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:42:13.123742Z","signed_message":"canonical_sha256_bytes"},"source_id":"1906.10830","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bd1e34878e20c291dcbecffc5fd73cbe1c65cfc3f996b07d12a257f97f63793d","sha256:0be56b4f797f61ba670f484dd1b61f00c4c41e84f1e863244811727df24f1eef"],"state_sha256":"da4737f757365ae697311033f998469620bed5150647250de7ed81067c46a34a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ztRlDCbYSiRLnVwt84IeKTLVlMRRjRd53pRfMrF8XNtWZpx44nlEHIwQccyHlUnhkAKOSxBelQ9Qmf+Ij3PcAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T03:57:31.952564Z","bundle_sha256":"17d42d9e4d7e1841524ce8586c3bcd9fd608c65b9353936c18395bdb2af7eff3"}}