{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.be-type-star","code":"thing-q812800","url":"https://ver.cy/models/thing/q812800/","name":"Be-type star","alternateNames":["shell star","Lambda Eridani variable","Gamma Cassiopeiae analog"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.SPC"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A Be-type star, in this sense, is a B-type star whose spectrum shows emission lines, encompassing classical Be stars with circumstellar decretion disks and other B-type emission-line stars, including young Herbig Be stars; Gamma Cassiopeiae and Achernar are classical examples, with shell stars and Lambda Eridani variables as related classes.","purpose":"Let an agent describe Be stars by example, disk properties, variability and observation, with sourced data.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["A B-type spectrum with emission lines defines this sense.","Classical Be stars have circumstellar decretion disks.","Disks in classical Be stars can vary.","Classical Be stars are usually rapid rotators."],"structure":{"bundles":[{"id":"star","name":"Star","description":"Which star.","layers":[{"id":"identity","name":"Identity","description":"Designation.","findings":[{"id":"identity-finding","name":"Identity","description":"Designation.","questions":[{"text":"Which Be star is meant, and what is its spectral type?","kind":"provenance"},{"text":"How far away is it?","kind":"measurement"}]}]},{"id":"class","name":"Class","description":"Subclass.","findings":[{"id":"class-finding","name":"Class","description":"Subclass.","questions":[{"text":"Is it a classical Be, shell or Be/X-ray binary star?","kind":"definition"},{"text":"What evidence supports this?","kind":"provenance"}]}]}]},{"id":"disk","name":"Disk","description":"Circumstellar disk.","layers":[{"id":"emission","name":"Emission","description":"H-alpha.","findings":[{"id":"emission-finding","name":"Emission","description":"Emission lines.","questions":[{"text":"What do the emission lines show about the disk?","kind":"provenance"},{"text":"How strong is H-alpha emission?","kind":"measurement"}]}]},{"id":"variability","name":"Variability","description":"Disk changes.","findings":[{"id":"variability-finding","name":"Variability","description":"Variability.","questions":[{"text":"Has the disk grown or dissipated over time?","kind":"provenance"},{"text":"Which monitoring shows it?","kind":"provenance"}]}]}]},{"id":"physics","name":"Physics","description":"Causes.","layers":[{"id":"rotation","name":"Rotation","description":"Near-critical.","findings":[{"id":"rotation-finding","name":"Rotation","description":"Rotation.","questions":[{"text":"How fast does the star rotate relative to its critical speed?","kind":"measurement"},{"text":"How is it measured?","kind":"provenance"}]}]},{"id":"binarity","name":"Binarity","description":"Companions.","findings":[{"id":"binarity-finding","name":"Binarity","description":"Companions.","questions":[{"text":"Is a companion star known?","kind":"provenance"},{"text":"Does it affect the disk?","kind":"provenance"}]}]}]},{"id":"observing","name":"Observing","description":"Amateur spectroscopy.","layers":[{"id":"spectra","name":"Spectra","description":"Equipment.","findings":[{"id":"spectra-finding","name":"Spectra","description":"Amateur spectra.","questions":[{"text":"Can amateur spectrographs detect the emission?","kind":"boundary"},{"text":"What equipment is needed?","kind":"definition"}]}]},{"id":"submit","name":"Submit","description":"Databases.","findings":[{"id":"submit-finding","name":"Submit","description":"Submitting spectra.","questions":[{"text":"How can spectra be submitted to the BeSS database?","kind":"action"},{"text":"What standards apply?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Report spectral and variability data of Be stars from catalogues, citing them.","Analyse spectra to detect emission lines and disk changes."],"mustNot":["Classify a star as a Be star without spectral evidence.","Present uncertain measurements as firm.","Use other observers' spectra without credit."],"requiresHuman":["Submitting new classifications to a catalogue."]},"ethics":{"considerations":["Amateur spectroscopists contribute data and deserve credit.","Errors in catalogues propagate into later research."],"affectedParties":["Astronomers and observers","Users of catalogues"]},"owners":{"steward":"Nobody: natural objects in space; star catalogues record them.","roles":[],"masterSystems":["Star catalogues"]},"relations":[{"target":"Q14745279","type":"parent","note":"registry parent class"},{"target":"Q72803622","type":"parent","note":"registry parent class"},{"target":"B-type star and emission-line star","type":"related","note":"category"},{"target":"decretion disk","type":"related","note":"structure"},{"target":"Herbig Ae/Be star","type":"related","note":"young star class"},{"target":"Gamma Cassiopeiae","type":"related","note":"example"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.be-type-star","Wikidata: Q812800 (https://www.wikidata.org/wiki/Q812800)","Be Star Spectra database: BeSS entries spectra"]},"properties":{"applicability":"required","items":["Effective temperature:  K - Effective temperature is inferred from stellar spectra and atmosphere models with allowance for rapid rotation and disk emission.","Projected equatorial rotation speed:  km/s - Projected rotation speed is inferred from photospheric spectral line broadening and depends on viewing inclination.","Circumstellar disk radius:  AU - Disk radius is inferred from interferometry or emission models and depends on the wavelength and boundary definition."]},"recognition":{"applicability":"required","items":["Hydrogen emission lines, especially H-alpha, are common spectral indicators.","Rapid rotation is characteristic of classical Be stars but is not required across this broader sense.","Herbig Be stars are young B-type emission-line stars included in this sense, while Herbig Ae stars are A-type stars.","Hot blue-white stars; their disks are detected in spectra rather than seen directly."]},"capabilities":{"applicability":"required","items":["identify Be star examples","explain emission lines and disks","find spectroscopic data","contribute amateur spectroscopy"]},"hazards":{"applicability":"required","items":["Confusing classical Be and Herbig Be stars","Overinterpreting single spectra"]},"interfaces":{"applicability":"required","items":["MK spectral classification"]},"context":{"applicability":"required","items":["Studying rapid rotation, mass loss and disks around hot stars.","classical Be stars","shell stars","Be/X-ray binaries","Lambda Eridani variables","Gamma Cassiopeiae analogues"]}},"sources":[{"title":"Wikidata item Q812800: Be-type star","url":"https://www.wikidata.org/wiki/Q812800","note":"identity and sense of the item"},{"title":"Wikipedia: Be star","url":"https://en.wikipedia.org/wiki/Be_star","note":"general description of the item"}],"openQuestions":["Should subclasses be separate entries?","How should spectra databases be linked?","How should binarity be recorded?"],"resources":{"spec":"/models/things/publications/thing-q812800/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q812800/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T10:25:10Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T12:16:34+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}