{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:PQOWR2SSSWGOFFQUP4CM5266MJ","short_pith_number":"pith:PQOWR2SS","canonical_record":{"source":{"id":"1809.05581","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-14T20:40:39Z","cross_cats_sorted":[],"title_canon_sha256":"4620c969bfd7dfa123756341b89626e89303432cfe5c4a76bb1d6c264bc7a213","abstract_canon_sha256":"8f329feda61106f6bab4bd59e34eba54e69f5024a8f6037e0fe6912039caf7ea"},"schema_version":"1.0"},"canonical_sha256":"7c1d68ea52958ce296147f04ceebde62683c4f143f98906ba580d9ae20594c6e","source":{"kind":"arxiv","id":"1809.05581","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.05581","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"arxiv_version","alias_value":"1809.05581v1","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.05581","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"pith_short_12","alias_value":"PQOWR2SSSWGO","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"PQOWR2SSSWGOFFQU","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"PQOWR2SS","created_at":"2026-05-18T12:32:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:PQOWR2SSSWGOFFQUP4CM5266MJ","target":"record","payload":{"canonical_record":{"source":{"id":"1809.05581","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-14T20:40:39Z","cross_cats_sorted":[],"title_canon_sha256":"4620c969bfd7dfa123756341b89626e89303432cfe5c4a76bb1d6c264bc7a213","abstract_canon_sha256":"8f329feda61106f6bab4bd59e34eba54e69f5024a8f6037e0fe6912039caf7ea"},"schema_version":"1.0"},"canonical_sha256":"7c1d68ea52958ce296147f04ceebde62683c4f143f98906ba580d9ae20594c6e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:49.819059Z","signature_b64":"fPBkINLu7dD9CFx2Nsd/n0QSwEhYWpKJDikHwIbItKSMGl5XsNx/DUF80w9fZqqIqWaLw9dEeXVqHL+QBxgACg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7c1d68ea52958ce296147f04ceebde62683c4f143f98906ba580d9ae20594c6e","last_reissued_at":"2026-05-17T23:59:49.818643Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:49.818643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.05581","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":"2026-05-17T23:59:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iOph5Ku3pLCWaxQPebnM1+L5P7fdOgbqbrwHCQb/BFj3yo3Nzau3hbGk5Sohs5fUrlYX9OeBV3EcRZGuUQ+xCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T08:13:21.319975Z"},"content_sha256":"8ec62039c9088bbf732ac4163d23c4c55044e069b217e1c562c38e0eb98039e0","schema_version":"1.0","event_id":"sha256:8ec62039c9088bbf732ac4163d23c4c55044e069b217e1c562c38e0eb98039e0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:PQOWR2SSSWGOFFQUP4CM5266MJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"HD 38858: a solar type star with a $\\sim$10.8 yr activity cycle. Searching for Balmer and metallic line variations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Buccino, C. Saffe, F. M. L\\'opez, J. F. Gonz\\'alez, M. Flores, M. Jaque Arancibia, P. Miquelarena, R.V Iba\\~nez Bustos","submitted_at":"2018-09-14T20:40:39Z","abstract_excerpt":"Context. The detection of chromospheric activity cycles in solar-analogue and twin stars, can be used to put in context the solar cycle. However, there is a relatively low percentage of these stars with activity cycles detected. It is well known that the cores of Ca II H&K lines are modulated by stellar activity. The behaviour of Balmer and other optical lines with stellar activity is not yet completely understood.\n  Aims. To search for Ca II H&K, Balmer and Fe II line variations modulated by the stellar activity. In particular, we apply a novel strategy to detect possible shape variations in "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.05581","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":"2026-05-17T23:59:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9tdHV9b+fToXwxhehI7EPDTSJaGshnMeOeQ9tX5EX67XM0QbIURdzCfkIr9ddA2cAuyeUzUBoMZ0wxQFSx0/BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T08:13:21.320717Z"},"content_sha256":"c2edc0d5690712284c8fbcdfb6347a64131bdcb2dc8f8f433adc5171492ffd82","schema_version":"1.0","event_id":"sha256:c2edc0d5690712284c8fbcdfb6347a64131bdcb2dc8f8f433adc5171492ffd82"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PQOWR2SSSWGOFFQUP4CM5266MJ/bundle.json","state_url":"https://pith.science/pith/PQOWR2SSSWGOFFQUP4CM5266MJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PQOWR2SSSWGOFFQUP4CM5266MJ/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":"2026-05-31T08:13:21Z","links":{"resolver":"https://pith.science/pith/PQOWR2SSSWGOFFQUP4CM5266MJ","bundle":"https://pith.science/pith/PQOWR2SSSWGOFFQUP4CM5266MJ/bundle.json","state":"https://pith.science/pith/PQOWR2SSSWGOFFQUP4CM5266MJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PQOWR2SSSWGOFFQUP4CM5266MJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:PQOWR2SSSWGOFFQUP4CM5266MJ","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":"8f329feda61106f6bab4bd59e34eba54e69f5024a8f6037e0fe6912039caf7ea","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-14T20:40:39Z","title_canon_sha256":"4620c969bfd7dfa123756341b89626e89303432cfe5c4a76bb1d6c264bc7a213"},"schema_version":"1.0","source":{"id":"1809.05581","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.05581","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"arxiv_version","alias_value":"1809.05581v1","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.05581","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"pith_short_12","alias_value":"PQOWR2SSSWGO","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"PQOWR2SSSWGOFFQU","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"PQOWR2SS","created_at":"2026-05-18T12:32:46Z"}],"graph_snapshots":[{"event_id":"sha256:c2edc0d5690712284c8fbcdfb6347a64131bdcb2dc8f8f433adc5171492ffd82","target":"graph","created_at":"2026-05-17T23:59:49Z","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":"Context. The detection of chromospheric activity cycles in solar-analogue and twin stars, can be used to put in context the solar cycle. However, there is a relatively low percentage of these stars with activity cycles detected. It is well known that the cores of Ca II H&K lines are modulated by stellar activity. The behaviour of Balmer and other optical lines with stellar activity is not yet completely understood.\n  Aims. To search for Ca II H&K, Balmer and Fe II line variations modulated by the stellar activity. In particular, we apply a novel strategy to detect possible shape variations in ","authors_text":"A. Buccino, C. Saffe, F. M. L\\'opez, J. F. Gonz\\'alez, M. Flores, M. Jaque Arancibia, P. Miquelarena, R.V Iba\\~nez Bustos","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-14T20:40:39Z","title":"HD 38858: a solar type star with a $\\sim$10.8 yr activity cycle. Searching for Balmer and metallic line variations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.05581","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":"sha256:8ec62039c9088bbf732ac4163d23c4c55044e069b217e1c562c38e0eb98039e0","target":"record","created_at":"2026-05-17T23:59:49Z","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":"8f329feda61106f6bab4bd59e34eba54e69f5024a8f6037e0fe6912039caf7ea","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-14T20:40:39Z","title_canon_sha256":"4620c969bfd7dfa123756341b89626e89303432cfe5c4a76bb1d6c264bc7a213"},"schema_version":"1.0","source":{"id":"1809.05581","kind":"arxiv","version":1}},"canonical_sha256":"7c1d68ea52958ce296147f04ceebde62683c4f143f98906ba580d9ae20594c6e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7c1d68ea52958ce296147f04ceebde62683c4f143f98906ba580d9ae20594c6e","first_computed_at":"2026-05-17T23:59:49.818643Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:49.818643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fPBkINLu7dD9CFx2Nsd/n0QSwEhYWpKJDikHwIbItKSMGl5XsNx/DUF80w9fZqqIqWaLw9dEeXVqHL+QBxgACg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:49.819059Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.05581","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8ec62039c9088bbf732ac4163d23c4c55044e069b217e1c562c38e0eb98039e0","sha256:c2edc0d5690712284c8fbcdfb6347a64131bdcb2dc8f8f433adc5171492ffd82"],"state_sha256":"b3edd09eaa8391185105a4a12190582793a61bdcad24c3f94ae6146880cd8d9e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LjIIdp9cKm1OKaxCpZK1aG0SZMqcSZ5hbWs3u04y+SgwpXbzJ5uCeAjX6GzR2Kn0IWAiOfdNioPcvl86skKHAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T08:13:21.324690Z","bundle_sha256":"d95aa1ad6dd2406f34d11f0192e21639d7236bc3208d0b87b1e714a0aa0efa42"}}