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We determined the fundamental physical parameters using the geometric distance of the star and the most recent synthetic colour grids. The results are:\n  [Fe/H]=-0.9+/-0.2, Mbol=0.73+/-0.43 mag, <Teff>=6800+/-200 K, log g=2.7+/-0.2, R=4.6+/-0.9 Ro.\n  Additionally, we took medium resolution (lambda/Delta lambda=11000)"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"astro-ph/9902091","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-02-05T11:21:24Z","cross_cats_sorted":[],"title_canon_sha256":"5d8318b2489941f17cf485cba2c13ec3dac66b8b43a6e6681f2844dbdf32517e","abstract_canon_sha256":"d4e5c9954aa64bc4e6191ff3e9ccc8ea45b9e636d51e2d44bb43e75e61003f82"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:36.605704Z","signature_b64":"7NzqNmag6OU9k1XumuumJGANawGoHGii67SZH/65doMGsbNu8ID+dxQlqw9gBfbj6iNr/reWhGYDRkgmn5w9CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e765b62dce8da0e7f418793cf24bea22c58ab0b4ebfecdff2ec18336759c3cec","last_reissued_at":"2026-05-18T01:07:36.605091Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:36.605091Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"V2109 Cygni, a second overtone field RR Lyrae star","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"B. 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