{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.semiregular-variable-star","code":"thing-q1054411","url":"https://ver.cy/models/thing/q1054411/","name":"semiregular variable star","alternateNames":["SRS semi-regular","Long Secondary Period variable","SRb semi-regular variable star","SRa semi-regular variable star","SRd semi-regular variable star","SRc semi-regular variable 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 giant or supergiant pulsating variable star showing periodic brightness changes interrupted by irregularities, with periods from about 20 to over 2000 days; subclasses include SRa, SRb, SRc and SRd.","purpose":"Let an agent describe semiregular variables by subclass, period, amplitude and observation, with sourced data.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Semi-periodic pulsation","Giants and supergiants","Smaller amplitudes than Miras","Common among red giants"],"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":"What is the star variable designation?","kind":"provenance"},{"text":"Which subclass is it?","kind":"definition"}]}]},{"id":"type","name":"Type","description":"Giant or supergiant.","findings":[{"id":"type-finding","name":"Type","description":"Star type.","questions":[{"text":"Is it a giant or supergiant, of which spectral type?","kind":"definition"},{"text":"How far away is it?","kind":"measurement"}]}]}]},{"id":"variability","name":"Variability","description":"Light curve.","layers":[{"id":"period","name":"Period","description":"Timescales.","findings":[{"id":"period-finding","name":"Period","description":"Period.","questions":[{"text":"What periods does it show?","kind":"measurement"},{"text":"Is there a long secondary period?","kind":"provenance"}]}]},{"id":"amplitude","name":"Amplitude","description":"Range.","findings":[{"id":"amplitude-finding","name":"Amplitude","description":"Amplitude.","questions":[{"text":"What is the brightness range?","kind":"measurement"},{"text":"How irregular is it?","kind":"definition"}]}]}]},{"id":"physics","name":"Physics","description":"Pulsation.","layers":[{"id":"mechanism","name":"Mechanism","description":"Pulsation modes.","findings":[{"id":"mechanism-finding","name":"Mechanism","description":"Mechanism.","questions":[{"text":"What drives the pulsation, according to studies?","kind":"provenance"},{"text":"How certain is it?","kind":"boundary"}]}]},{"id":"evolution","name":"Evolution","description":"Stage.","findings":[{"id":"evolution-finding","name":"Evolution","description":"Evolutionary stage.","questions":[{"text":"What evolutionary stage does it indicate?","kind":"definition"},{"text":"How does it relate to Miras?","kind":"definition"}]}]}]},{"id":"observing","name":"Observing","description":"Contributing.","layers":[{"id":"visibility","name":"Visibility","description":"Equipment.","findings":[{"id":"visibility-finding","name":"Visibility","description":"Visibility.","questions":[{"text":"Can it be observed with binoculars or small telescopes?","kind":"boundary"},{"text":"When is it best placed?","kind":"measurement"}]}]},{"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":["Describe semiregular variables and their subclasses from variable star catalogues.","Help observers log brightness estimates to the databases they contribute to."],"mustNot":["Submit fabricated or unchecked observations to shared variable star databases.","Misattribute observations to the wrong observer."],"requiresHuman":["Reclassifying a star in a catalogue that others rely on."]},"ethics":{"considerations":["Amateur observers contribute much of the data and deserve credit.","Shared databases depend on honest reporting."],"affectedParties":["Observers","Astronomers"]},"owners":{"steward":"Nobody: held in common; variable star catalogues and observer databases record them.","roles":[],"masterSystems":["General Catalogue of Variable Stars","Variable star observer databases"]},"relations":[{"target":"Q1153690","type":"parent","note":"registry parent class"},{"target":"Q353834","type":"parent","note":"registry parent class"},{"target":"pulsating variable star","type":"related","note":"category"},{"target":"Mira variable","type":"related","note":"long-period variables"},{"target":"red giant","type":"related","note":"star type"},{"target":"GCVS and VSX","type":"related","note":"catalogues"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.semiregular-variable-star","Wikidata: Q1054411 (https://www.wikidata.org/wiki/Q1054411)","GCVS designation: variable star names catalogue"]},"properties":{"applicability":"required","items":["period: about 20-2000 days","amplitude: up to about 2.5 magnitudes - visual"]},"recognition":{"applicability":"required","items":["GCVS types SRa, SRb, SRc, SRd","Irregular periodic light curves","Long secondary periods in some","Red giant or supergiant stars varying in brightness over weeks to years."]},"capabilities":{"applicability":"required","items":["classify by subclass","record light curves","submit observations to databases","compare with Mira variables"]},"hazards":{"applicability":"required","items":["Misclassifying subtype","Overinterpreting sparse data"]},"interfaces":{"applicability":"required","items":["IAU variable star nomenclature"]},"context":{"applicability":"required","items":["Studying late stellar evolution and pulsation.","SRa","SRb","SRc (supergiants)","SRd (yellow giants)","stars with long secondary periods"]}},"sources":[{"title":"Wikidata item Q1054411: semiregular variable star","url":"https://www.wikidata.org/wiki/Q1054411","note":"identity and sense of the item"},{"title":"Wikipedia: Semiregular variable star","url":"https://en.wikipedia.org/wiki/Semiregular_variable_star","note":"general description of the item"}],"openQuestions":["Should subclasses be separate entries?","How should VSX data be linked?","How should long secondary periods be explained?"],"resources":{"spec":"/models/things/publications/thing-q1054411/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1054411/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T09:19:58Z","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}}