{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:AQE676GMZVBTKAIIKR5DTXNTNX","short_pith_number":"pith:AQE676GM","canonical_record":{"source":{"id":"1111.3250","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-11-14T15:42:42Z","cross_cats_sorted":[],"title_canon_sha256":"ff881145f7d6f8bdef2b739d985eeee7b4aad8b5070e93c33b86f5f6b258cea5","abstract_canon_sha256":"7b4e8769168760a97af614c29f27508b74cb7695fd24d199020d26ac0c4f9af0"},"schema_version":"1.0"},"canonical_sha256":"0409eff8cccd43350108547a39ddb36deae6d76a21fbdb9a2ae93696856be887","source":{"kind":"arxiv","id":"1111.3250","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.3250","created_at":"2026-05-18T01:59:33Z"},{"alias_kind":"arxiv_version","alias_value":"1111.3250v1","created_at":"2026-05-18T01:59:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.3250","created_at":"2026-05-18T01:59:33Z"},{"alias_kind":"pith_short_12","alias_value":"AQE676GMZVBT","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"AQE676GMZVBTKAII","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"AQE676GM","created_at":"2026-05-18T12:26:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:AQE676GMZVBTKAIIKR5DTXNTNX","target":"record","payload":{"canonical_record":{"source":{"id":"1111.3250","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-11-14T15:42:42Z","cross_cats_sorted":[],"title_canon_sha256":"ff881145f7d6f8bdef2b739d985eeee7b4aad8b5070e93c33b86f5f6b258cea5","abstract_canon_sha256":"7b4e8769168760a97af614c29f27508b74cb7695fd24d199020d26ac0c4f9af0"},"schema_version":"1.0"},"canonical_sha256":"0409eff8cccd43350108547a39ddb36deae6d76a21fbdb9a2ae93696856be887","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:59:33.747866Z","signature_b64":"8rPUdSQvn5Zu7a2NafRFUvKtZ6ByualDX1wInCcvg/Cwfk7OOHHRRV9cM6b5EPwtLTXrU3NPZOUrb4/RdqPICg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0409eff8cccd43350108547a39ddb36deae6d76a21fbdb9a2ae93696856be887","last_reissued_at":"2026-05-18T01:59:33.747236Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:59:33.747236Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1111.3250","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":"2026-05-18T01:59:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SxWGT1UbzdN4G9i0yIh2bG3OY7QnB3qLapdYB2Goji++oAeKcvj3mLvy8RZjYBaj7rLxonRvi0YS5sAj0P5OCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T11:10:56.368552Z"},"content_sha256":"1332094b4b41427174f71967fdc616f75d7b366920991ce39b995a1db6d93618","schema_version":"1.0","event_id":"sha256:1332094b4b41427174f71967fdc616f75d7b366920991ce39b995a1db6d93618"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:AQE676GMZVBTKAIIKR5DTXNTNX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"VLT/X-shooter observations and the chemical composition of cool white dwarfs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Adela Kawka, Stephane Vennes","submitted_at":"2011-11-14T15:42:42Z","abstract_excerpt":"We present a model atmosphere analysis of cool hydrogen-rich white dwarfs observed at the Very Large Telescope (VLT) with the X-shooter spectrograph. The intermediate-dispersion and high signal-to-noise ratio of the spectra allowed us to conduct a detailed analysis of hydrogen and heavy element line profiles. In particular, we tested various prescriptions for hydrogen Balmer line broadening parameters and determined the effective temperature and surface gravity of each star. Three objects (NLTT 1675, 6390 and 11393) show the presence of heavy elements (Mg, Al, Ca, or Fe). Our abundance analysi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.3250","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":"2026-05-18T01:59:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZkEK/WEmUfYM4j5esMncLzcvsVjv0l2dT1UzjysfFd7ljODbajxlL/pv6EULmS68nYvupanF7uIuoIU4CyaGDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T11:10:56.368894Z"},"content_sha256":"042ea93c0a2d72e0e3447e10660791d0b110492b6acf8b3248de418b8cd0be04","schema_version":"1.0","event_id":"sha256:042ea93c0a2d72e0e3447e10660791d0b110492b6acf8b3248de418b8cd0be04"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AQE676GMZVBTKAIIKR5DTXNTNX/bundle.json","state_url":"https://pith.science/pith/AQE676GMZVBTKAIIKR5DTXNTNX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AQE676GMZVBTKAIIKR5DTXNTNX/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":"2026-06-29T11:10:56Z","links":{"resolver":"https://pith.science/pith/AQE676GMZVBTKAIIKR5DTXNTNX","bundle":"https://pith.science/pith/AQE676GMZVBTKAIIKR5DTXNTNX/bundle.json","state":"https://pith.science/pith/AQE676GMZVBTKAIIKR5DTXNTNX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AQE676GMZVBTKAIIKR5DTXNTNX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:AQE676GMZVBTKAIIKR5DTXNTNX","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":"7b4e8769168760a97af614c29f27508b74cb7695fd24d199020d26ac0c4f9af0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-11-14T15:42:42Z","title_canon_sha256":"ff881145f7d6f8bdef2b739d985eeee7b4aad8b5070e93c33b86f5f6b258cea5"},"schema_version":"1.0","source":{"id":"1111.3250","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.3250","created_at":"2026-05-18T01:59:33Z"},{"alias_kind":"arxiv_version","alias_value":"1111.3250v1","created_at":"2026-05-18T01:59:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.3250","created_at":"2026-05-18T01:59:33Z"},{"alias_kind":"pith_short_12","alias_value":"AQE676GMZVBT","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"AQE676GMZVBTKAII","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"AQE676GM","created_at":"2026-05-18T12:26:24Z"}],"graph_snapshots":[{"event_id":"sha256:042ea93c0a2d72e0e3447e10660791d0b110492b6acf8b3248de418b8cd0be04","target":"graph","created_at":"2026-05-18T01:59:33Z","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"},"paper":{"abstract_excerpt":"We present a model atmosphere analysis of cool hydrogen-rich white dwarfs observed at the Very Large Telescope (VLT) with the X-shooter spectrograph. The intermediate-dispersion and high signal-to-noise ratio of the spectra allowed us to conduct a detailed analysis of hydrogen and heavy element line profiles. In particular, we tested various prescriptions for hydrogen Balmer line broadening parameters and determined the effective temperature and surface gravity of each star. Three objects (NLTT 1675, 6390 and 11393) show the presence of heavy elements (Mg, Al, Ca, or Fe). Our abundance analysi","authors_text":"Adela Kawka, Stephane Vennes","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-11-14T15:42:42Z","title":"VLT/X-shooter observations and the chemical composition of cool white dwarfs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.3250","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":"sha256:1332094b4b41427174f71967fdc616f75d7b366920991ce39b995a1db6d93618","target":"record","created_at":"2026-05-18T01:59:33Z","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":"7b4e8769168760a97af614c29f27508b74cb7695fd24d199020d26ac0c4f9af0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-11-14T15:42:42Z","title_canon_sha256":"ff881145f7d6f8bdef2b739d985eeee7b4aad8b5070e93c33b86f5f6b258cea5"},"schema_version":"1.0","source":{"id":"1111.3250","kind":"arxiv","version":1}},"canonical_sha256":"0409eff8cccd43350108547a39ddb36deae6d76a21fbdb9a2ae93696856be887","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0409eff8cccd43350108547a39ddb36deae6d76a21fbdb9a2ae93696856be887","first_computed_at":"2026-05-18T01:59:33.747236Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:59:33.747236Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8rPUdSQvn5Zu7a2NafRFUvKtZ6ByualDX1wInCcvg/Cwfk7OOHHRRV9cM6b5EPwtLTXrU3NPZOUrb4/RdqPICg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:59:33.747866Z","signed_message":"canonical_sha256_bytes"},"source_id":"1111.3250","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1332094b4b41427174f71967fdc616f75d7b366920991ce39b995a1db6d93618","sha256:042ea93c0a2d72e0e3447e10660791d0b110492b6acf8b3248de418b8cd0be04"],"state_sha256":"a4dbc73445fbc3edddb0db0ad79f02a90729f0d27789b58c94322ad9eea97fdd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FiXEb36FjX5mTxoIeD//6wMU87hh+HPjFiwIWq9eSL7+OvtaOm6y+vMA78oF+6LPx7nqzgAMBCv7xJ58cKLRAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-29T11:10:56.370776Z","bundle_sha256":"d6d113711140cc471d29956eb8ab1a694aa04028bd3326cfed8ed151d5094100"}}