{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.alpha-canum-venaticorum-variable","code":"thing-q1141942","url":"https://ver.cy/models/thing/q1141942/","name":"Alpha² Canum Venaticorum variable","alternateNames":["rapidly oscillating Ap star"],"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 chemically peculiar Ap or Bp main-sequence star with a strong, ordered magnetic field and surface abundance spots, whose brightness and spectrum vary with rotation over periods of about 0.5 to 160 days; named after Alpha2 Canum Venaticorum. Rapidly oscillating Ap stars are a related class with pulsations of minutes.","purpose":"Let an agent describe alpha2 CVn variables by star, period, magnetic field and spectroscopy, with sourced data.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Strong magnetic fields","Chemical spots","Rotational variability","Oblique rotator model"],"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 star is meant, and is it classified as ACV?","kind":"provenance"},{"text":"What is its spectral type?","kind":"provenance"}]}]},{"id":"period","name":"Period","description":"Rotation.","findings":[{"id":"period-finding","name":"Period","description":"Rotation period.","questions":[{"text":"What is its rotation period and amplitude?","kind":"measurement"},{"text":"From which survey data?","kind":"provenance"}]}]}]},{"id":"physics","name":"Physics","description":"Magnetism.","layers":[{"id":"field","name":"Field","description":"Magnetic field.","findings":[{"id":"field-finding","name":"Field","description":"Magnetic field.","questions":[{"text":"How strong is the magnetic field, according to spectropolarimetry?","kind":"measurement"},{"text":"How is it oriented?","kind":"provenance"}]}]},{"id":"spots","name":"Spots","description":"Abundance spots.","findings":[{"id":"spots-finding","name":"Spots","description":"Chemical spots.","questions":[{"text":"Which elements are concentrated in surface spots?","kind":"provenance"},{"text":"How are spot maps made?","kind":"definition"}]}]}]},{"id":"classes","name":"Classes","description":"Related types.","layers":[{"id":"roap","name":"roAp","description":"Rapid oscillators.","findings":[{"id":"roap-finding","name":"roAp","description":"Rapidly oscillating Ap stars.","questions":[{"text":"Does the star also show rapid oscillations?","kind":"provenance"},{"text":"How do roAp stars differ from ACV variables?","kind":"definition"}]}]},{"id":"chemically-peculiar","name":"Chemically peculiar","description":"Ap and Bp stars.","findings":[{"id":"chemically-peculiar-finding","name":"Chemically peculiar","description":"Chemical peculiarity.","questions":[{"text":"What makes Ap and Bp stars chemically peculiar?","kind":"definition"},{"text":"Which processes explain it?","kind":"provenance"}]}]}]},{"id":"observing","name":"Observing","description":"Contributing.","layers":[{"id":"photometry","name":"Photometry","description":"Small amplitudes.","findings":[{"id":"photometry-finding","name":"Photometry","description":"Photometry.","questions":[{"text":"What photometric precision is needed to detect the variation?","kind":"measurement"},{"text":"Can amateurs contribute?","kind":"boundary"}]}]},{"id":"submit","name":"Submit","description":"Databases.","findings":[{"id":"submit-finding","name":"Submit","description":"Submitting data.","questions":[{"text":"How can observations be submitted to variable star databases?","kind":"action"},{"text":"Which organisation runs them?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Report catalogued Alpha2 Canum Venaticorum variables with their periods and sources.","Analyze light curves and spectra to classify a star as this type, stating the uncertainty."],"mustNot":["Confuse these stars with rapidly oscillating Ap stars.","Claim a new variable star from small amplitude signals without checking for instrument effects.","Alter catalogue entries without stating the source of the change."],"requiresHuman":["Submitting a new classification to a variable star catalogue."]},"ethics":{"considerations":["Honest reporting of weak signals keeps the astronomical record trustworthy."],"affectedParties":["Astronomers and observers","Users of variable star catalogues"]},"owners":{"steward":"Nobody owns them; variable star catalogues and the astronomical community keep the records.","roles":[],"masterSystems":["General Catalogue of Variable Stars","International Variable Star Index"]},"relations":[{"target":"Q2168098","type":"parent","note":"registry parent class"},{"target":"Q616386","type":"parent","note":"registry parent class"},{"target":"rotating variable star and Ap/Bp star","type":"related","note":"category"},{"target":"Alpha2 Canum Venaticorum","type":"related","note":"prototype"},{"target":"oblique rotator model","type":"related","note":"theory"},{"target":"GCVS and VSX","type":"related","note":"catalogues"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.alpha-canum-venaticorum-variable","Wikidata: Q1141942 (https://www.wikidata.org/wiki/Q1141942)","GCVS type: ACV variable star type"]},"properties":{"applicability":"required","items":["rotation period: about 0.5-160 days","amplitude: about 0.01-0.1 magnitudes - typical"]},"recognition":{"applicability":"required","items":["Ap or Bp spectral types","Rotation-linked variability","roAp stars pulsate on minute timescales","Blue-white stars with small periodic brightness changes."]},"capabilities":{"applicability":"required","items":["identify alpha2 CVn stars and periods","explain rotational modulation","distinguish them from roAp stars","find photometric and spectroscopic data"]},"hazards":{"applicability":"required","items":["Confusing ACV and roAp stars","Overinterpreting small amplitudes"]},"interfaces":{"applicability":"required","items":["IAU variable star nomenclature"]},"context":{"applicability":"required","items":["Studying stellar magnetism and chemical peculiarity.","classical alpha2 CVn variables","magnetic Bp stars","rapidly oscillating Ap stars (related)"]}},"sources":[{"title":"Wikidata item Q1141942: Alpha² Canum Venaticorum variable","url":"https://www.wikidata.org/wiki/Q1141942","note":"identity and sense of the item"},{"title":"Wikipedia: Alpha2 Canum Venaticorum variable","url":"https://en.wikipedia.org/wiki/Alpha2_Canum_Venaticorum_variable","note":"general description of the item"}],"openQuestions":["Should roAp stars be a separate entry?","How should magnetic field data be linked?","How should spot maps be sourced?"],"resources":{"spec":"/models/things/publications/thing-q1141942/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1141942/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T11:39:17Z","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 2026-10-06T19:51:53+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}