{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-11T19:32:26Z",
    "providers": [
      "Claude"
    ],
    "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify",
    "pass": 2,
    "wave": 2,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-05T18:30:00Z",
      "ingestedAt": "2026-10-05T13:34:49+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-06T19:51:54+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q14557003",
    "registryId": "vr.tr.bl-herculis-variable",
    "name": "BL Herculis variable",
    "version": "0.2.0-wave.2",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.SPC"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q14557003/",
  "model": {
    "registry_id": "vr.tr.bl-herculis-variable",
    "name": "BL Herculis variable",
    "purpose": "Let an agent explain BL Herculis variables by properties, relation to other Type II Cepheids and classical Cepheids, use in distance measurement, and observation data.",
    "definition": "A class of Type II Cepheid variable stars with pulsation periods of about one to four days, named after the prototype BL Herculis, which are old, low-mass, metal-poor stars often showing a bump on the light curve; they are the short-period counterparts of W Virginis variables and are used as distance indicators.",
    "what_it_is_for": "Stellar astrophysics and distance measurement.",
    "affordances": [
      "describe BL Herculis star properties",
      "distinguish them from other Cepheid types",
      "explain their period-luminosity relation",
      "find light curves and catalogues"
    ],
    "distinguishing_features": [
      "Type II Cepheid",
      "Short periods",
      "Old, metal-poor stars",
      "Distance indicators"
    ],
    "appearance": "Pulsating stars with regular light curves and short periods, in old stellar populations.",
    "visual_identification": [
      "Periods of about 1-4 days",
      "Found in globular clusters and the halo",
      "W Virginis stars have longer periods"
    ],
    "physical_properties": [
      {
        "quantity": "pulsation period",
        "typical_range": "about 1-4",
        "unit": "days",
        "note": "typical"
      }
    ],
    "families_and_kinds": [
      "BL Herculis stars",
      "W Virginis stars (longer periods)",
      "RV Tauri stars (longest periods)"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "Type II Cepheid",
        "why": "category"
      },
      {
        "relation": "has example",
        "target": "BL Herculis",
        "why": "prototype"
      },
      {
        "relation": "is related to",
        "target": "W Virginis variable",
        "why": "related class"
      },
      {
        "relation": "is contrasted with",
        "target": "classical Cepheid",
        "why": "related class"
      }
    ],
    "identifiers": [
      {
        "scheme": "GCVS type",
        "value_or_pattern": "CWB",
        "note": "variable star type"
      }
    ],
    "standards_and_regulation": [
      "General Catalogue of Variable Stars classification"
    ],
    "failure_modes_and_hazards": [
      "Confusing with classical Cepheids or RR Lyrae stars",
      "Misclassifying by period alone"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Report known BL Herculis variables and their properties from astronomical catalogues.",
        "Explain how they differ from classical Cepheids and their use as distance indicators."
      ],
      "must_not": [
        "Classify a star as a BL Herculis variable without a published study.",
        "Present distances derived from them without stated uncertainty.",
        "Attribute observations to observers or surveys that did not make them."
      ],
      "requires_human": [
        "Submitting a classification to a variable star catalogue."
      ]
    },
    "ethics": {
      "considerations": [
        "Shared catalogues depend on honest, sourced classifications.",
        "Amateur and professional observers deserve credit for their data."
      ],
      "affected_parties": [
        "Astronomers using the catalogues",
        "Amateur observers"
      ]
    },
    "owners": {
      "steward": "Nobody: natural objects held in common; variable star catalogues maintain classifications.",
      "master_systems": [
        "General Catalogue of Variable Stars",
        "Variable star databases"
      ]
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q14557003: BL Herculis variable",
      "url": "https://www.wikidata.org/wiki/Q14557003",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: BL Herculis variable",
      "url": "https://en.wikipedia.org/wiki/BL_Herculis_variable",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "properties",
        "name": "Properties",
        "description": "What they are.",
        "rationale": "Class properties.",
        "layers": [
          {
            "id": "star",
            "name": "Star",
            "description": "Stellar properties.",
            "findings": [
              {
                "id": "star-finding",
                "name": "Star",
                "description": "Stellar properties.",
                "questions": [
                  {
                    "text": "What are the period, luminosity and metallicity of this star?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Which population does it belong to?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "classify",
            "name": "Classify",
            "description": "Type II subclasses.",
            "findings": [
              {
                "id": "classify-finding",
                "name": "Classify",
                "description": "Subclass.",
                "questions": [
                  {
                    "text": "Is the star a BL Herculis, W Virginis or RV Tauri variable, or an RR Lyrae star?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which criteria decide?",
                    "kind": "definition"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "physics",
        "name": "Physics",
        "description": "Pulsation.",
        "rationale": "Why they pulsate.",
        "layers": [
          {
            "id": "mechanism",
            "name": "Mechanism",
            "description": "Pulsation mechanism.",
            "findings": [
              {
                "id": "mechanism-finding",
                "name": "Mechanism",
                "description": "Mechanism.",
                "questions": [
                  {
                    "text": "What drives the pulsation of BL Herculis stars?",
                    "kind": "definition"
                  },
                  {
                    "text": "What causes the bump on the light curve?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "evolution",
            "name": "Evolution",
            "description": "Evolutionary state.",
            "findings": [
              {
                "id": "evolution-finding",
                "name": "Evolution",
                "description": "Evolutionary state.",
                "questions": [
                  {
                    "text": "What evolutionary stage are these stars in?",
                    "kind": "provenance"
                  },
                  {
                    "text": "How do they differ from classical Cepheids in origin?",
                    "kind": "definition"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "distances",
        "name": "Distances",
        "description": "Standard candles.",
        "rationale": "Relations give distances.",
        "layers": [
          {
            "id": "relation",
            "name": "Relation",
            "description": "Period-luminosity.",
            "findings": [
              {
                "id": "relation-finding",
                "name": "Relation",
                "description": "Period-luminosity relation.",
                "questions": [
                  {
                    "text": "What period-luminosity relation applies to BL Herculis stars?",
                    "kind": "provenance"
                  },
                  {
                    "text": "How is it calibrated?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "use",
            "name": "Use",
            "description": "Applications.",
            "findings": [
              {
                "id": "use-finding",
                "name": "Use",
                "description": "Applications.",
                "questions": [
                  {
                    "text": "How are they used to measure distances to clusters and the Galactic bulge?",
                    "kind": "definition"
                  },
                  {
                    "text": "What uncertainties apply?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "observing",
        "name": "Observing",
        "description": "Data.",
        "rationale": "Observers contribute.",
        "layers": [
          {
            "id": "data",
            "name": "Data",
            "description": "Light curves.",
            "findings": [
              {
                "id": "data-finding",
                "name": "Data",
                "description": "Light curves.",
                "questions": [
                  {
                    "text": "Where can light curves and catalogue entries be found?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which surveys observe them?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "amateur",
            "name": "Amateur",
            "description": "Observing.",
            "findings": [
              {
                "id": "amateur-finding",
                "name": "Amateur",
                "description": "Amateur observing.",
                "questions": [
                  {
                    "text": "Can this star be observed by amateurs?",
                    "kind": "boundary"
                  },
                  {
                    "text": "How can observations be reported?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should Type II Cepheids be a single entry?",
    "How should catalogues be linked?",
    "How should distance calibrations be recorded?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}