{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:AVJYJL5VLYPFKCOQTIRQ7GA7JD","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":"3c5f35b0fb3d0b55b3d463b424247e4deec2a2a5204af596ddbce20c2eec0efb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-10-28T11:11:06Z","title_canon_sha256":"b9bf7caaa523bf5ea1bfb2762d0c32020017e2d2d8ffca2be0b080a964488c78"},"schema_version":"1.0","source":{"id":"1910.12557","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1910.12557","created_at":"2026-07-05T00:31:27Z"},{"alias_kind":"arxiv_version","alias_value":"1910.12557v1","created_at":"2026-07-05T00:31:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1910.12557","created_at":"2026-07-05T00:31:27Z"},{"alias_kind":"pith_short_12","alias_value":"AVJYJL5VLYPF","created_at":"2026-07-05T00:31:27Z"},{"alias_kind":"pith_short_16","alias_value":"AVJYJL5VLYPFKCOQ","created_at":"2026-07-05T00:31:27Z"},{"alias_kind":"pith_short_8","alias_value":"AVJYJL5V","created_at":"2026-07-05T00:31:27Z"}],"graph_snapshots":[{"event_id":"sha256:78427f8cf5a61930b66bbe16f75c340457c71e94f41501fc06e5ce16168aec8f","target":"graph","created_at":"2026-07-05T00:31:27Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1910.12557/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Stellar magnetic activity decays over the main-sequence life of cool stars due to the stellar spin-down driven by magnetic braking. The evolution of chromospheric emission is well-studied for younger stars, but difficulties in determining the ages of older cool stars on the main sequence have complicated such studies for older stars in the past. Here we report on chromospheric Ca II H and K line measurements for 26 main-sequence cool stars with asteroseismic ages older than a gigayear and spectral types F and G. We find that for the G stars and the cooler F-type stars which still have convecti","authors_text":"C. A. Watson, D. Stello, H. Bruntt, K. Poppenhaeger, R S Booth, V. Silva Aguirre","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-10-28T11:11:06Z","title":"Chromospheric emission of solar-type stars with asteroseismic ages"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1910.12557","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:f3b6e139af2e8d083c23b0549b3bae2552dea7eff19b836de187671a770f6f21","target":"record","created_at":"2026-07-05T00:31:27Z","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":"3c5f35b0fb3d0b55b3d463b424247e4deec2a2a5204af596ddbce20c2eec0efb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-10-28T11:11:06Z","title_canon_sha256":"b9bf7caaa523bf5ea1bfb2762d0c32020017e2d2d8ffca2be0b080a964488c78"},"schema_version":"1.0","source":{"id":"1910.12557","kind":"arxiv","version":1}},"canonical_sha256":"055384afb55e1e5509d09a230f981f48e361672240627c8c418f69d72e58d95e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"055384afb55e1e5509d09a230f981f48e361672240627c8c418f69d72e58d95e","first_computed_at":"2026-07-05T00:31:27.387866Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:31:27.387866Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"E/BCu9umu8SzqhMXK724vVJEcpMr2TQXLNPdyEGIptCg63tQkFybegtGuni/yKgmO07kn6Ca6nl9Gd+0kCYzAA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:31:27.388289Z","signed_message":"canonical_sha256_bytes"},"source_id":"1910.12557","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f3b6e139af2e8d083c23b0549b3bae2552dea7eff19b836de187671a770f6f21","sha256:78427f8cf5a61930b66bbe16f75c340457c71e94f41501fc06e5ce16168aec8f"],"state_sha256":"1e5c0f1e9b55ca293dccf366f06df0f8af11afc6124dff9451dead487fcaa9b0"}