{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1995:NA5HYV5PEHYTXAZOHSSTRCRYIF","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":"5ae283cde20920fd5db81ee955522562704eb95702b8576d45959eb3f435bda7","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1995-02-28T16:21:10Z","title_canon_sha256":"cca94613cb191e801ea7fd577446151c52aa39a550a32ac776bd96f2ce1ae88a"},"schema_version":"1.0","source":{"id":"astro-ph/9502106","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9502106","created_at":"2026-05-18T03:47:42Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9502106v1","created_at":"2026-05-18T03:47:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9502106","created_at":"2026-05-18T03:47:42Z"},{"alias_kind":"pith_short_12","alias_value":"NA5HYV5PEHYT","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"NA5HYV5PEHYTXAZO","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"NA5HYV5P","created_at":"2026-05-18T12:25:47Z"}],"graph_snapshots":[{"event_id":"sha256:45f5cef5fa7a3f9620dd57a5c5bf15a840544992a305c7848f7a632117dcd887","target":"graph","created_at":"2026-05-18T03:47:42Z","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 report the results of new SPH calculations of parabolic collisions between main-sequence (MS) stars. The stars are assumed to be close to the MS turn-off point in a globular cluster and are therefore modeled as $n=3$, $\\Gamma=5/3$ polytropes. We find that the high degree of central mass concentration in these stars has a profound effect on the hydrodynamics. In particular, very little hydrodynamic mixing occurs between the dense, helium-rich inner cores and the outer envelopes. As a result, and in contrast to what has been assumed in previous studies, blue stragglers formed by direct stella","authors_text":"Frederic A. Rasio, James C. Lombardi, Jr., Stuart L. Shapiro","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1995-02-28T16:21:10Z","title":"ON BLUE STRAGGLER FORMATION BY DIRECT COLLISIONS OF MAIN-SEQUENCE STARS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9502106","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":"sha256:1053dd8c20fa36c2149c15b9b68383bb635696924200f76895dbb91ba7fdc17b","target":"record","created_at":"2026-05-18T03:47:42Z","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":"5ae283cde20920fd5db81ee955522562704eb95702b8576d45959eb3f435bda7","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1995-02-28T16:21:10Z","title_canon_sha256":"cca94613cb191e801ea7fd577446151c52aa39a550a32ac776bd96f2ce1ae88a"},"schema_version":"1.0","source":{"id":"astro-ph/9502106","kind":"arxiv","version":1}},"canonical_sha256":"683a7c57af21f13b832e3ca5388a384166695084e8a6519c598d49c59a325f0a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"683a7c57af21f13b832e3ca5388a384166695084e8a6519c598d49c59a325f0a","first_computed_at":"2026-05-18T03:47:42.891930Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:47:42.891930Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"C54WCXHQOGD6Ywc2fnQRrt06W69o0mpruu/0KTwetOF95HzxZOCqr2JMUybpGwGQFkr9NNP8/UiIYM+rc0gnBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:47:42.892532Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9502106","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1053dd8c20fa36c2149c15b9b68383bb635696924200f76895dbb91ba7fdc17b","sha256:45f5cef5fa7a3f9620dd57a5c5bf15a840544992a305c7848f7a632117dcd887"],"state_sha256":"830ddb8f3f338111b8f8945771fc5087e2da39e7f686f33ba309dc0d8c56f4b8"}