{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.delta-scuti-variable","code":"thing-q836976","url":"https://ver.cy/models/thing/q836976/","name":"Delta Scuti variable","alternateNames":["SX Phoenicis variable","AI Velorum variable","low amplitude Delta Scuti variable"],"kind":"thing","status":"research-draft","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 pulsating variable star of spectral type A or F near the main sequence, varying in brightness with periods of about 0.02 to 0.25 days through radial and non-radial pulsations; SX Phoenicis stars are a related metal-poor group.","purpose":"Let an agent describe Delta Scuti variables by star, periods, amplitude and asteroseismology, with sourced data.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Short-period pulsation","Multiple pulsation modes","Near the main sequence","Used in asteroseismology"],"structure":{"bundles":[{"id":"identity","name":"Identity","description":"Which star.","layers":[{"id":"designation","name":"Designation","description":"Name.","findings":[{"id":"designation-finding","name":"Designation","description":"Designation.","questions":[{"text":"Which star is meant, and what is its variable type?","kind":"provenance"},{"text":"Which catalogue classifies it?","kind":"provenance"}]}]},{"id":"type","name":"Type","description":"Spectral type.","findings":[{"id":"type-finding","name":"Type","description":"Spectral type.","questions":[{"text":"What is its spectral type and luminosity class?","kind":"provenance"},{"text":"How far away is it?","kind":"measurement"}]}]}]},{"id":"variability","name":"Variability","description":"Light curve.","layers":[{"id":"periods","name":"Periods","description":"Frequencies.","findings":[{"id":"periods-finding","name":"Periods","description":"Periods.","questions":[{"text":"What pulsation periods are detected?","kind":"measurement"},{"text":"From which survey data?","kind":"provenance"}]}]},{"id":"amplitude","name":"Amplitude","description":"Range.","findings":[{"id":"amplitude-finding","name":"Amplitude","description":"Amplitude.","questions":[{"text":"What is the amplitude of variation?","kind":"measurement"},{"text":"Is it low or high amplitude?","kind":"definition"}]}]}]},{"id":"science","name":"Science","description":"Asteroseismology.","layers":[{"id":"modes","name":"Modes","description":"Identification.","findings":[{"id":"modes-finding","name":"Modes","description":"Pulsation modes.","questions":[{"text":"Which modes have been identified, according to studies?","kind":"provenance"},{"text":"How certain are they?","kind":"boundary"}]}]},{"id":"interior","name":"Interior","description":"Structure.","findings":[{"id":"interior-finding","name":"Interior","description":"Interior structure.","questions":[{"text":"What do the pulsations reveal about the interior?","kind":"provenance"},{"text":"Which models are used?","kind":"provenance"}]}]}]},{"id":"observing","name":"Observing","description":"Contributing.","layers":[{"id":"equipment","name":"Equipment","description":"Photometry.","findings":[{"id":"equipment-finding","name":"Equipment","description":"Equipment.","questions":[{"text":"What equipment is needed to detect the variation?","kind":"definition"},{"text":"Is time-series photometry required?","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 periods, amplitudes and classification of Delta Scuti variables from catalogues, citing them.","Analyse public light curves to find pulsation frequencies."],"mustNot":["Classify a star as a Delta Scuti variable without the evidence the classification needs.","Present noisy or uncertain frequencies as firm results.","Use other observers' data without crediting them."],"requiresHuman":["Submitting new variable star classifications to a catalogue."]},"ethics":{"considerations":["Amateur observers contribute much of the data; their work deserves credit.","Errors in catalogues propagate into later research."],"affectedParties":["Professional and amateur astronomers","Users of catalogues"]},"owners":{"steward":"Nobody: natural objects in space; variable star catalogues record them.","roles":[],"masterSystems":["Variable star catalogues"]},"relations":[{"target":"Q353834","type":"parent","note":"registry parent class"},{"target":"pulsating variable star","type":"related","note":"category"},{"target":"Delta Scuti","type":"related","note":"prototype"},{"target":"asteroseismology","type":"related","note":"field"},{"target":"GCVS and VSX","type":"related","note":"catalogues"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.delta-scuti-variable","Wikidata: Q836976 (https://www.wikidata.org/wiki/Q836976)","GCVS type: DSCT variable star type"]},"properties":{"applicability":"required","items":["period: about 0.02-0.25 days","amplitude: up to about 0.9 magnitudes - most much smaller"]},"recognition":{"applicability":"required","items":["Spectral types A to F","Periods of hours","RR Lyrae stars have longer periods and larger amplitudes","White or yellow-white stars with small, rapid brightness changes."]},"capabilities":{"applicability":"required","items":["look up periods and amplitudes","explain asteroseismology in general terms","find photometric data from surveys","distinguish related classes"]},"hazards":{"applicability":"required","items":["Misclassification with similar pulsators","Overinterpreting mode identifications"]},"interfaces":{"applicability":"required","items":["IAU variable star nomenclature"]},"context":{"applicability":"required","items":["Asteroseismology and understanding stellar interiors.","low-amplitude Delta Scuti stars","high-amplitude Delta Scuti stars","SX Phoenicis variables"]}},"sources":[],"openQuestions":["Should SX Phoenicis stars be a separate entry?","How should survey light curves be linked?","How should mode identifications be recorded?"],"resources":{"spec":"/models/things/publications/thing-q836976/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q836976/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T10:06:49Z","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":"missing"},"notes":{"sources":"Written from model knowledge without web access; claims are unverified."},"score":0.941}}