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The helium (He/H=0.08) and oxygen (O/H=0.001) abundances are about solar while carbon is enriched by a factor of 2.5 (C/H=0.001). Nitrogen (N/H = 10**(-6), [N/H] = -2.0) appears at a sub-solar value. However, these metal abundances are much higher than the cluster's metallicity M 15: [Fe/H] = -2.25).\n  The sur"},"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/0111062","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2001-11-03T09:26:24Z","cross_cats_sorted":[],"title_canon_sha256":"10aee702d9ec25a3eccbf03894b3fb3b44a0c106ca5e20c6f0b4a2a9cc586908","abstract_canon_sha256":"5af389033a8953f6c817f71fd1edbbe8114029bfa4ebdbf3bc92fb3dbaa0a0a0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:24:24.487636Z","signature_b64":"VdLtbDftTsUgsgrNM5csD8fIlteW4PNadEV6BIjvVZkbMNk7Ck/IGKPfhBERXTPwU/ymhrtLcZsudkAg4fdKCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9c8a0523f9e244af8096541c5aaf7d3aeefe9a260a58a57e8aea65019a09de36","last_reissued_at":"2026-07-04T16:24:24.487202Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:24:24.487202Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Spectral analysis of the sdO K 648, the exciting star of the planetary nebula Ps 1 in the globular cluster M 15 (NGC 7078)","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"K. Werner, T. Rauch, U. Heber","submitted_at":"2001-11-03T09:26:24Z","abstract_excerpt":"We present a spectral analysis of the sdO central star K 648 based on medium-resolution optical and high-resolution UV spectra. The photospheric parameters are determined by means of state-of-the-art NLTE model atmosphere techniques.\n  We found Teff = 39 +/- 2 kK and log g = 3.9 +/- 0.2. The helium (He/H=0.08) and oxygen (O/H=0.001) abundances are about solar while carbon is enriched by a factor of 2.5 (C/H=0.001). Nitrogen (N/H = 10**(-6), [N/H] = -2.0) appears at a sub-solar value. 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