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FK Comae Berenices variable

vr.tr.fk-comae-berenices-variable · thing-q1388754

Let an agent explain FK Comae variables by mechanism, properties and proposed origin, relate them to other rotating variables, and support data access.

Thing Registry Physical world and living systems PHY.SPC
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources

Bundle → Layer → Finding → Questions Filled

4 bundles · 8 layers · 8 findings · 16 questions

Mechanism Why they vary.

Spots

Starspots.

Spots

Starspots.

  1. How do starspots and rapid rotation produce the light variations? definition
  2. What is the rotation period? measurement

Activity

Chromospheric activity.

Activity

Activity.

  1. How strong is the chromospheric and coronal activity of this star? measurement
  2. How is it measured? provenance
Origin Why they spin fast.

Merger

Merger hypothesis.

Merger

Merger hypothesis.

  1. Why are these giants rotating so fast, and what does the binary merger hypothesis propose? provenance
  2. What evidence supports or challenges it? provenance

Evolution

Evolutionary state.

Evolution

Evolutionary state.

  1. What evolutionary stage are FK Comae stars in? provenance
  2. How rare are they? measurement
Properties What they are.

Star

Stellar properties.

Star

Stellar properties.

  1. What are the spectral type, luminosity and rotation velocity of this star? provenance
  2. How large is the amplitude? measurement

Classify

Classification.

Classify

Classification.

  1. Is the star an FK Comae variable or an RS CVn binary, and which criteria decide? definition
  2. Which catalogue records it? provenance
Observing Data.

Data

Light curves.

Data

Light curves.

  1. Where can light curves and spectra for this star be found? provenance
  2. Which surveys observe it? provenance

Amateur

Observing.

Amateur

Amateur observing.

  1. Can amateurs detect the variations with photometry? boundary
  2. How can observations be reported? action

Classifiers Filled

Family
Thing Registry
Category
Physical world and living systems
Entry kind
thing
Plane
PHY
Domain
PHY.SPC

What it is Filled

A class of rapidly rotating giant stars of spectral types G and K with strong chromospheric activity, whose brightness varies by a few tenths of a magnitude as large starspots rotate in and out of view, with periods of days; the prototype is FK Comae Berenices, and the class may originate from merged binary stars.

Why it exists Filled

Let an agent explain FK Comae variables by mechanism, properties and proposed origin, relate them to other rotating variables, and support data access.

Distinguishing features Filled

  • Rapidly rotating giants
  • Starspot modulation
  • Apparently single
  • Possible merger remnants

What robots and AI may and may not do Filled

Must not

  • Present a star as an FK Comae variable without the catalogue or study that classifies it.
  • Overstate the precision of periods, magnitudes or classifications.
  • Attribute observations to observers or surveys that did not make them.

Only with a human decision

  • Submitting a new classification or observation to a variable star catalogue.

May

  • Report known FK Comae Berenices stars and their properties from astronomical catalogues.
  • Explain how starspots and rapid rotation produce their variability.

Moral aspects Filled

  • Shared catalogues depend on honest, sourced classifications.
  • Amateur and professional observers deserve credit for their data.

Who is affected

  • Astronomers using the catalogues
  • Amateur observers

Owners Filled

Steward

Nobody: natural objects held in common; variable star catalogues maintain classifications.

Master systems

  • General Catalogue of Variable Stars
  • Variable star databases

Links to other meta-models Filled

parent

  • Q2168098 - registry parent class

related

  • rotating variable star - category
  • FK Comae Berenices - prototype
  • BY Draconis variable - other rotating variable
  • SX Arietis variable - other rotating variable

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.fk-comae-berenices-variable
  • Wikidata: Q1388754 (https://www.wikidata.org/wiki/Q1388754)
  • GCVS type: FKCOM variable star type

Direct properties required Filled

  • Rotation period: day - The period is typically on the order of days and is estimated from recurring starspot modulation in a brightness time series.
  • Photometric amplitude: magnitude - The difference between maximum and minimum measured brightness depends on the observing band and changing starspot coverage.
  • Projected equatorial rotation speed: km/s - Rotational broadening of spectral lines estimates the equatorial rotation speed multiplied by the sine of the viewing inclination.

Recognition required Filled

  • Rapidly rotating single giants
  • Strong chromospheric emission
  • RS CVn variables are active binaries instead
  • Yellow-orange giant stars with small periodic brightness variations.

Capabilities and actions required Filled

  • describe the rotational modulation mechanism
  • identify FK Comae star properties
  • summarise the merger origin hypothesis with attribution
  • find light curves and catalogues

Hazards and failure modes required Filled

  • Confusing with RS CVn binaries
  • Presenting the merger origin as settled

Standards and interfaces required Filled

  • General Catalogue of Variable Stars classification

Context of use required Filled

  • Stellar astrophysics and variable star observing.
  • FK Comae stars
  • related RS Canum Venaticorum variables (binaries)
  • related BY Draconis variables (dwarfs)

Sources Filled

  1. Wikidata item Q1388754: FK Comae Berenices variable - identity and sense of the item
  2. Wikipedia (de): FK-Comae-Berenices-Stern - general description of the item

Open questions

  • Should RS CVn variables be linked or merged?
  • How should activity data be linked?
  • How should survey data be linked?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q1388754/spec.json