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With the core-halo structure, a more massive star has a more extended envelope, then the track of upper zero-age main-sequence (ZAMS) curves redward in the H-R diagram at > 100 M_sol (Z=0.02), >70 M_sol (Z=0.05), and > 15 M_sol for helium ZAMS (X=0., Z=0.02). Therefore, effective temperature of a very massive ZAMS star is rather low: e.g., for the 200 M_sol star, log T_eff=4.75 (Z=0"},"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/9907154","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-07-13T02:15:13Z","cross_cats_sorted":[],"title_canon_sha256":"381feffc2bf6271f5f0931ddb05d968a2f461adef5568b10c87467dff3780df2","abstract_canon_sha256":"f2fdec551e64aa0aafcd5d02a052593d48e147c0d325212b6ea800924af6d043"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:12.928117Z","signature_b64":"V5ap51saiH+r+iMONQHYdrEST7Z1GvbQH4XcGZjD9AeylxrRdnUY/gosa6ynE6nYfVG1E/z2WgxEjGWe6dKXAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dfda1198fb7ee80821f9756c7da427bad6d74fdb92ec5c1ed2e991a750c96617","last_reissued_at":"2026-05-18T01:40:12.927418Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:12.927418Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Core-halo Structure of Chemically Homogeneous Massive Star and Bending of Zero-Age Main-Sequence","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Mariko Kato (Keio Univ.), Mie Ishii, Munetaka Ueno (Univ. of Tokyo)","submitted_at":"1999-07-13T02:15:13Z","abstract_excerpt":"We have recalculated interior structure of very massive stars of uniform chemical composition with the OPAL opacity. 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