{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:6GN5GCIW5VWUFP72FXFD5V2DMZ","short_pith_number":"pith:6GN5GCIW","canonical_record":{"source":{"id":"1811.01016","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-29T18:01:10Z","cross_cats_sorted":[],"title_canon_sha256":"b9e3b5f087b5dd006ebd378eec139c6b01377649e337132a70de124dc1e9d681","abstract_canon_sha256":"037ccff27b5787e26fc00984057db723ec329a0ed78200b2fc1664f3e2bf4860"},"schema_version":"1.0"},"canonical_sha256":"f19bd30916ed6d42bffa2dca3ed743665e1db2f06fe4742c5998561d587a76a5","source":{"kind":"arxiv","id":"1811.01016","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.01016","created_at":"2026-05-17T23:56:45Z"},{"alias_kind":"arxiv_version","alias_value":"1811.01016v1","created_at":"2026-05-17T23:56:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.01016","created_at":"2026-05-17T23:56:45Z"},{"alias_kind":"pith_short_12","alias_value":"6GN5GCIW5VWU","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"6GN5GCIW5VWUFP72","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"6GN5GCIW","created_at":"2026-05-18T12:32:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:6GN5GCIW5VWUFP72FXFD5V2DMZ","target":"record","payload":{"canonical_record":{"source":{"id":"1811.01016","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-29T18:01:10Z","cross_cats_sorted":[],"title_canon_sha256":"b9e3b5f087b5dd006ebd378eec139c6b01377649e337132a70de124dc1e9d681","abstract_canon_sha256":"037ccff27b5787e26fc00984057db723ec329a0ed78200b2fc1664f3e2bf4860"},"schema_version":"1.0"},"canonical_sha256":"f19bd30916ed6d42bffa2dca3ed743665e1db2f06fe4742c5998561d587a76a5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:56:45.105980Z","signature_b64":"0GKcuKjglYwO/XjXHRhfFAUU61YYiTzX37OuQm7vADKbUrekdXf21qUU22ddn9blBFh8xWWujvucnA8yzrB8AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f19bd30916ed6d42bffa2dca3ed743665e1db2f06fe4742c5998561d587a76a5","last_reissued_at":"2026-05-17T23:56:45.105598Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:56:45.105598Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.01016","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":"2026-05-17T23:56:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pdv33uK4W1gf6F1/LhLKGTMvIbWJNEdFzcWt80kkbUonTH34JgNsDA6+Z4asJoo3D6mgxDejNafDEjH8kb+rBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T23:04:22.866490Z"},"content_sha256":"e79d6b3e0e83c47a707efa8ccfac623b27bcc596ffa09ed17201a8c5ca10dc54","schema_version":"1.0","event_id":"sha256:e79d6b3e0e83c47a707efa8ccfac623b27bcc596ffa09ed17201a8c5ca10dc54"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:6GN5GCIW5VWUFP72FXFD5V2DMZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The double Blue Straggler sequence in NGC2173: a field contamination artefact","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B. Lanzoni, E. Dalessandro, F.R. Ferraro, M. Cadelano, N. Bastian, S. Raso","submitted_at":"2018-10-29T18:01:10Z","abstract_excerpt":"Here we discuss the case of the double Blue Straggler Star (BSS) sequence recently detected in the young stellar cluster NGC 2173 in the Large Magellanic Cloud by Li et al (2018). In order to investigate this feature we made use of two HST sets of observations, one (the same one used by Li et al.) probing the cluster central regions, and the other sampling the surrounding field. We demonstrate that when field star decontamination is applied, ~40% of BSS population selected by Li et al. turns out to be composed by field stars interlopers. This contamination mainly affects one of the two sequenc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.01016","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":"2026-05-17T23:56:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"imiLK57LP6KBObBRAy1s7nfrHrLiQV+o2KSSFwrxHIn5kU0a8fi/7s2t83xdoJ1Izb1ivD5gMPNm05JU/NjpDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T23:04:22.866849Z"},"content_sha256":"e45d61689d69155860d1ffc9daa4380821ffd4cfa31ab9a81e6c77ae18cf1c0f","schema_version":"1.0","event_id":"sha256:e45d61689d69155860d1ffc9daa4380821ffd4cfa31ab9a81e6c77ae18cf1c0f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6GN5GCIW5VWUFP72FXFD5V2DMZ/bundle.json","state_url":"https://pith.science/pith/6GN5GCIW5VWUFP72FXFD5V2DMZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6GN5GCIW5VWUFP72FXFD5V2DMZ/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":"2026-05-31T23:04:22Z","links":{"resolver":"https://pith.science/pith/6GN5GCIW5VWUFP72FXFD5V2DMZ","bundle":"https://pith.science/pith/6GN5GCIW5VWUFP72FXFD5V2DMZ/bundle.json","state":"https://pith.science/pith/6GN5GCIW5VWUFP72FXFD5V2DMZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6GN5GCIW5VWUFP72FXFD5V2DMZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:6GN5GCIW5VWUFP72FXFD5V2DMZ","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":"037ccff27b5787e26fc00984057db723ec329a0ed78200b2fc1664f3e2bf4860","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-29T18:01:10Z","title_canon_sha256":"b9e3b5f087b5dd006ebd378eec139c6b01377649e337132a70de124dc1e9d681"},"schema_version":"1.0","source":{"id":"1811.01016","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.01016","created_at":"2026-05-17T23:56:45Z"},{"alias_kind":"arxiv_version","alias_value":"1811.01016v1","created_at":"2026-05-17T23:56:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.01016","created_at":"2026-05-17T23:56:45Z"},{"alias_kind":"pith_short_12","alias_value":"6GN5GCIW5VWU","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"6GN5GCIW5VWUFP72","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"6GN5GCIW","created_at":"2026-05-18T12:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:e45d61689d69155860d1ffc9daa4380821ffd4cfa31ab9a81e6c77ae18cf1c0f","target":"graph","created_at":"2026-05-17T23:56:45Z","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":"Here we discuss the case of the double Blue Straggler Star (BSS) sequence recently detected in the young stellar cluster NGC 2173 in the Large Magellanic Cloud by Li et al (2018). In order to investigate this feature we made use of two HST sets of observations, one (the same one used by Li et al.) probing the cluster central regions, and the other sampling the surrounding field. We demonstrate that when field star decontamination is applied, ~40% of BSS population selected by Li et al. turns out to be composed by field stars interlopers. This contamination mainly affects one of the two sequenc","authors_text":"B. Lanzoni, E. Dalessandro, F.R. Ferraro, M. Cadelano, N. Bastian, S. Raso","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-29T18:01:10Z","title":"The double Blue Straggler sequence in NGC2173: a field contamination artefact"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.01016","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:e79d6b3e0e83c47a707efa8ccfac623b27bcc596ffa09ed17201a8c5ca10dc54","target":"record","created_at":"2026-05-17T23:56:45Z","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":"037ccff27b5787e26fc00984057db723ec329a0ed78200b2fc1664f3e2bf4860","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-29T18:01:10Z","title_canon_sha256":"b9e3b5f087b5dd006ebd378eec139c6b01377649e337132a70de124dc1e9d681"},"schema_version":"1.0","source":{"id":"1811.01016","kind":"arxiv","version":1}},"canonical_sha256":"f19bd30916ed6d42bffa2dca3ed743665e1db2f06fe4742c5998561d587a76a5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f19bd30916ed6d42bffa2dca3ed743665e1db2f06fe4742c5998561d587a76a5","first_computed_at":"2026-05-17T23:56:45.105598Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:56:45.105598Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0GKcuKjglYwO/XjXHRhfFAUU61YYiTzX37OuQm7vADKbUrekdXf21qUU22ddn9blBFh8xWWujvucnA8yzrB8AA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:56:45.105980Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.01016","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e79d6b3e0e83c47a707efa8ccfac623b27bcc596ffa09ed17201a8c5ca10dc54","sha256:e45d61689d69155860d1ffc9daa4380821ffd4cfa31ab9a81e6c77ae18cf1c0f"],"state_sha256":"addeaaf8091a493b5c738f527ae03ec3ee6edaca13dca7a686ccf4dc2f1e19ce"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TJ+Xov79uXDlo67Sj68nizR23GBdurN6xy92TCZWpTVfiPLHxbS959By9ygh+ZSTpqxiSb2O0nbsDN0rwNFFCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T23:04:22.868852Z","bundle_sha256":"3a13fc22eca6404fbc40a3fcc14db71b6ea6ec1a747ac0ceaf7abf7bdb69ad7f"}}