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Both features  show that it contains at least two stellar populations.  The separation in magnitude has been ascribed to an age difference of  ~6 Gyr and interpreted as the result of an atypical evolutionary history for this cluster. We show that the observed HB morphology is also consistent with a model in which the bright HB  is composed of second generation stars that are metal enriched a"},"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":"1004.3426","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-04-20T12:27:49Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"753bb03f57c65463ee0e190088f8f6e51f6e2f6c0c440520a9b26ac4cdf17db4","abstract_canon_sha256":"c5f708d9f8830c6107cfd7ea520eb324faea8cd135cfaf9c298f173cb5df19b2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:07:56.261277Z","signature_b64":"PO55s7lAd/IY0RDLzA5VYe2vVh0Mp99vgc6m6MT36/2t3aKHrfIVG2zB+aKf2BsYOXjo7NujBa0EsDOaemGsBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b58c7365175103a551b502eee1b4b95d5b3896848df6a4c7b6becd5c368de47d","last_reissued_at":"2026-05-18T02:07:56.260601Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:07:56.260601Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Terzan 5: an alternative interpretation for the split horizontal branch","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"A. 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