{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-11T15:19:38Z",
    "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": 1,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-05T17:00:00Z",
      "ingestedAt": "2026-10-05T13:31:45+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-06T19:52:03+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q936076",
    "registryId": "vr.tr.w-virginis-variable",
    "name": "W Virginis variable",
    "version": "0.2.0-wave.1",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.SPC"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q936076/",
  "model": {
    "registry_id": "vr.tr.w-virginis-variable",
    "name": "W Virginis variable",
    "purpose": "Let an agent explain W Virginis variables by properties, distinction from classical Cepheids, use as distance indicators and observation data.",
    "definition": "A class of Type II Cepheid variable stars with pulsation periods of about 10 to 20 days, named after the prototype W Virginis, which are old, low-mass, metal-poor stars found in globular clusters and the galactic halo and are fainter than classical Cepheids of the same period.",
    "what_it_is_for": "Stellar astrophysics and distance measurement.",
    "affordances": [
      "describe W Virginis star properties",
      "distinguish them from classical Cepheids",
      "explain their period-luminosity relation",
      "find light curves and catalogues"
    ],
    "distinguishing_features": [
      "Type II Cepheid",
      "Old, metal-poor stars",
      "Fainter than classical Cepheids",
      "Distance indicators"
    ],
    "appearance": "Pulsating yellow supergiant-like stars with regular light curves, seen mainly in old stellar populations.",
    "visual_identification": [
      "Periods of about 10-20 days",
      "Found in globular clusters and the halo",
      "Classical Cepheids are younger and more luminous"
    ],
    "physical_properties": [
      {
        "quantity": "pulsation period",
        "typical_range": "about 10-20",
        "unit": "days",
        "note": "typical"
      }
    ],
    "families_and_kinds": [
      "W Virginis stars",
      "BL Herculis stars (shorter periods)",
      "RV Tauri stars (longer periods)",
      "peculiar W Virginis stars"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "Type II Cepheid",
        "why": "category"
      },
      {
        "relation": "has example",
        "target": "W Virginis",
        "why": "prototype"
      },
      {
        "relation": "is contrasted with",
        "target": "classical Cepheid",
        "why": "related class"
      },
      {
        "relation": "is related to",
        "target": "R Coronae Borealis variable",
        "why": "other variable class"
      }
    ],
    "identifiers": [
      {
        "scheme": "GCVS type",
        "value_or_pattern": "CWA",
        "note": "variable star type"
      }
    ],
    "standards_and_regulation": [
      "General Catalogue of Variable Stars classification"
    ],
    "failure_modes_and_hazards": [
      "Confusing with classical Cepheids in distance work",
      "Misclassifying peculiar stars"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Report W Virginis stars and their properties from published catalogues.",
        "Explain their use in distance measurement and how they differ from classical Cepheids."
      ],
      "must_not": [
        "Present a star's classification as certain when the catalogue lists it as uncertain.",
        "Misattribute observations or discoveries."
      ],
      "requires_human": [
        "Changing a star's classification in a public catalogue."
      ]
    },
    "ethics": {
      "considerations": [
        "Correct attribution credits observers, including amateurs.",
        "Confusing Cepheid types once distorted the cosmic distance scale; accuracy matters."
      ],
      "affected_parties": [
        "Astronomers, including amateur observers",
        "Students"
      ]
    },
    "owners": {
      "steward": "Nobody: a class of stars; astronomical catalogues record them.",
      "master_systems": [
        "Variable star catalogues"
      ]
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q936076: W Virginis variable",
      "url": "https://www.wikidata.org/wiki/Q936076",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: W Virginis variable",
      "url": "https://en.wikipedia.org/wiki/W_Virginis_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 W Virginis, BL Herculis or RV Tauri variable?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which criteria decide?",
                    "kind": "definition"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "distinction",
        "name": "Distinction",
        "description": "Cepheid types.",
        "rationale": "Types differ in age and brightness.",
        "layers": [
          {
            "id": "classical",
            "name": "Classical",
            "description": "Versus classical Cepheids.",
            "findings": [
              {
                "id": "classical-finding",
                "name": "Classical",
                "description": "Classical versus Type II.",
                "questions": [
                  {
                    "text": "How do W Virginis stars differ from classical Cepheids?",
                    "kind": "definition"
                  },
                  {
                    "text": "How was the distinction discovered, according to historians of astronomy?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "history",
            "name": "History",
            "description": "Distance scale history.",
            "findings": [
              {
                "id": "history-finding",
                "name": "History",
                "description": "History.",
                "questions": [
                  {
                    "text": "How did confusing the two types affect early distance estimates?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Who resolved it?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "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 Type II Cepheids?",
                    "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 W Virginis stars used to measure distances to globular clusters?",
                    "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 each subclass be a separate entry?",
    "How should catalogues be linked?",
    "How should distance calibrations be recorded?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}