{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:66Y4D56MSTIWUIQFWVMKFETR74","short_pith_number":"pith:66Y4D56M","canonical_record":{"source":{"id":"0909.2254","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-11T20:00:21Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"66eceb3d4933c7ae0f95c22c43b0009f787261d87ff1775de07ce643283b8d29","abstract_canon_sha256":"c41b23ab9c75c441c0d7724da5849615f25c04918d1deeb37e0e6d6cd92238a9"},"schema_version":"1.0"},"canonical_sha256":"f7b1c1f7cc94d16a2205b558a29271ff3bc502c6cf836c09d28e5c87dd40ed93","source":{"kind":"arxiv","id":"0909.2254","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2254","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2254v1","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2254","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"pith_short_12","alias_value":"66Y4D56MSTIW","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"66Y4D56MSTIWUIQF","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"66Y4D56M","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:66Y4D56MSTIWUIQFWVMKFETR74","target":"record","payload":{"canonical_record":{"source":{"id":"0909.2254","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-11T20:00:21Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"66eceb3d4933c7ae0f95c22c43b0009f787261d87ff1775de07ce643283b8d29","abstract_canon_sha256":"c41b23ab9c75c441c0d7724da5849615f25c04918d1deeb37e0e6d6cd92238a9"},"schema_version":"1.0"},"canonical_sha256":"f7b1c1f7cc94d16a2205b558a29271ff3bc502c6cf836c09d28e5c87dd40ed93","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:30.324751Z","signature_b64":"JZtDP/oi53qyzJd1Aie3tHIsjrvPMps8gtrobdI6Pz96cOvk/Xd2vaQM+G7d3gFblZTNFmsr/oPqYVJKaH7VDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f7b1c1f7cc94d16a2205b558a29271ff3bc502c6cf836c09d28e5c87dd40ed93","last_reissued_at":"2026-05-18T02:34:30.324118Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:30.324118Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0909.2254","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":"2026-05-18T02:34:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lLtsEuL3visHzGpWefLNpgSpt4guFeIkZe6kHg1L7Fn31W89m/ALEKKAAStYxZ8NujesiScAclngdR/nNry/AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T03:32:28.452979Z"},"content_sha256":"f3d4d290814a180d688b424f856685ef0441bc3cfaa3bf576521635029b0f0de","schema_version":"1.0","event_id":"sha256:f3d4d290814a180d688b424f856685ef0441bc3cfaa3bf576521635029b0f0de"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:66Y4D56MSTIWUIQFWVMKFETR74","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Spectral Types of White Dwarfs in Messier 4","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"David R. Reitzel, D. Saul Davis, Harvey B. Richer, Jason S. Kalirai, R. Michael Rich","submitted_at":"2009-09-11T20:00:21Z","abstract_excerpt":"We present the spectra of 24 white dwarfs in the direction of the globular cluster Messier 4 obtained with the Keck/LRIS and Gemini/GMOS spectrographs. Determining the spectral types of the stars in this sample, we find 24 type DA and 0 type DB (i.e., atmospheres dominated by hydrogen and helium respectively). Assuming the ratio of DA/DB observed in the field with effective temperature between 15,000 - 25,000 K, i.e., 4.2:1, holds for the cluster environment, the chance of finding no DBs in our sample due simply to statistical fluctuations is only 6 X 10^(-3). The spectral types of the ~100 wh"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2254","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":"2026-05-18T02:34:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3DBm1RSqZ3o3eqV1m3ZJzR4RNNDIIBJyU9f7JYSpINTiRwZBUOHkXe7M7eZEFhDgPPLj+SwsWHi2nPRiGpMlCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T03:32:28.453410Z"},"content_sha256":"2f0cf14ef1c17fe95cf5b481014d75928ee57c4a6183b6ebbc829ff5c86e3e02","schema_version":"1.0","event_id":"sha256:2f0cf14ef1c17fe95cf5b481014d75928ee57c4a6183b6ebbc829ff5c86e3e02"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/66Y4D56MSTIWUIQFWVMKFETR74/bundle.json","state_url":"https://pith.science/pith/66Y4D56MSTIWUIQFWVMKFETR74/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/66Y4D56MSTIWUIQFWVMKFETR74/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":"2026-05-27T03:32:28Z","links":{"resolver":"https://pith.science/pith/66Y4D56MSTIWUIQFWVMKFETR74","bundle":"https://pith.science/pith/66Y4D56MSTIWUIQFWVMKFETR74/bundle.json","state":"https://pith.science/pith/66Y4D56MSTIWUIQFWVMKFETR74/state.json","well_known_bundle":"https://pith.science/.well-known/pith/66Y4D56MSTIWUIQFWVMKFETR74/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:66Y4D56MSTIWUIQFWVMKFETR74","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":"c41b23ab9c75c441c0d7724da5849615f25c04918d1deeb37e0e6d6cd92238a9","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-11T20:00:21Z","title_canon_sha256":"66eceb3d4933c7ae0f95c22c43b0009f787261d87ff1775de07ce643283b8d29"},"schema_version":"1.0","source":{"id":"0909.2254","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2254","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2254v1","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2254","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"pith_short_12","alias_value":"66Y4D56MSTIW","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"66Y4D56MSTIWUIQF","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"66Y4D56M","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:2f0cf14ef1c17fe95cf5b481014d75928ee57c4a6183b6ebbc829ff5c86e3e02","target":"graph","created_at":"2026-05-18T02:34:30Z","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 the spectra of 24 white dwarfs in the direction of the globular cluster Messier 4 obtained with the Keck/LRIS and Gemini/GMOS spectrographs. Determining the spectral types of the stars in this sample, we find 24 type DA and 0 type DB (i.e., atmospheres dominated by hydrogen and helium respectively). Assuming the ratio of DA/DB observed in the field with effective temperature between 15,000 - 25,000 K, i.e., 4.2:1, holds for the cluster environment, the chance of finding no DBs in our sample due simply to statistical fluctuations is only 6 X 10^(-3). The spectral types of the ~100 wh","authors_text":"David R. Reitzel, D. Saul Davis, Harvey B. Richer, Jason S. Kalirai, R. Michael Rich","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-11T20:00:21Z","title":"The Spectral Types of White Dwarfs in Messier 4"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2254","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:f3d4d290814a180d688b424f856685ef0441bc3cfaa3bf576521635029b0f0de","target":"record","created_at":"2026-05-18T02:34:30Z","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":"c41b23ab9c75c441c0d7724da5849615f25c04918d1deeb37e0e6d6cd92238a9","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-11T20:00:21Z","title_canon_sha256":"66eceb3d4933c7ae0f95c22c43b0009f787261d87ff1775de07ce643283b8d29"},"schema_version":"1.0","source":{"id":"0909.2254","kind":"arxiv","version":1}},"canonical_sha256":"f7b1c1f7cc94d16a2205b558a29271ff3bc502c6cf836c09d28e5c87dd40ed93","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f7b1c1f7cc94d16a2205b558a29271ff3bc502c6cf836c09d28e5c87dd40ed93","first_computed_at":"2026-05-18T02:34:30.324118Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:34:30.324118Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JZtDP/oi53qyzJd1Aie3tHIsjrvPMps8gtrobdI6Pz96cOvk/Xd2vaQM+G7d3gFblZTNFmsr/oPqYVJKaH7VDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:34:30.324751Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.2254","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f3d4d290814a180d688b424f856685ef0441bc3cfaa3bf576521635029b0f0de","sha256:2f0cf14ef1c17fe95cf5b481014d75928ee57c4a6183b6ebbc829ff5c86e3e02"],"state_sha256":"8112f5709282cc17172b1b42b306dec144bb7f0e238cf6cc5ece64c22762e5d1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NjWq0TADjW5fwq2msIOILQvAXiB1w8NEs5+AnvQbhAJEtLtX6SUBmnKM54s/OVpYTi+pOY/poBMcSqRZ5IBSBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T03:32:28.457395Z","bundle_sha256":"612dcfe2fc3a40849c0ac1ed8a3f6600b2db73c047549ed21224d71d092bcd94"}}