Published
Be-type star
vr.tr.be-type-star · thing-q812800
Let an agent describe Be stars by example, disk properties, variability and observation, with sourced data.
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
Star Which star.
Identity
Designation.
Identity
Designation.
- Which Be star is meant, and what is its spectral type? provenance
- How far away is it? measurement
Class
Subclass.
Class
Subclass.
- Is it a classical Be, shell or Be/X-ray binary star? definition
- What evidence supports this? provenance
Disk Circumstellar disk.
Emission
H-alpha.
Emission
Emission lines.
- What do the emission lines show about the disk? provenance
- How strong is H-alpha emission? measurement
Variability
Disk changes.
Variability
Variability.
- Has the disk grown or dissipated over time? provenance
- Which monitoring shows it? provenance
Physics Causes.
Rotation
Near-critical.
Rotation
Rotation.
- How fast does the star rotate relative to its critical speed? measurement
- How is it measured? provenance
Binarity
Companions.
Binarity
Companions.
- Is a companion star known? provenance
- Does it affect the disk? provenance
Observing Amateur spectroscopy.
Spectra
Equipment.
Spectra
Amateur spectra.
- Can amateur spectrographs detect the emission? boundary
- What equipment is needed? definition
Submit
Databases.
Submit
Submitting spectra.
- How can spectra be submitted to the BeSS database? action
- What standards apply? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.SPC
- Other names and narrower kinds
- shell star, Lambda Eridani variable, Gamma Cassiopeiae analog
What it is Filled
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.
Why it exists Filled
Let an agent describe Be stars by example, disk properties, variability and observation, with sourced data.
Distinguishing features Filled
- 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.
What robots and AI may and may not do Filled
Must not
- Classify a star as a Be star without spectral evidence.
- Present uncertain measurements as firm.
- Use other observers' spectra without credit.
Only with a human decision
- Submitting new classifications to a catalogue.
May
- Report spectral and variability data of Be stars from catalogues, citing them.
- Analyse spectra to detect emission lines and disk changes.
Moral aspects Filled
- Amateur spectroscopists contribute data and deserve credit.
- Errors in catalogues propagate into later research.
Who is affected
- Astronomers and observers
- Users of catalogues
Owners Filled
Steward
Nobody: natural objects in space; star catalogues record them.
Master systems
- Star catalogues
Links to other meta-models Filled
parent
- Q14745279 - registry parent class
- Q72803622 - registry parent class
related
- B-type star and emission-line star - category
- decretion disk - structure
- Herbig Ae/Be star - young star class
- Gamma Cassiopeiae - example
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.be-type-star
- Wikidata: Q812800 (https://www.wikidata.org/wiki/Q812800)
- Be Star Spectra database: BeSS entries spectra
Direct properties required Filled
- 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 required Filled
- 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 and actions required Filled
- identify Be star examples
- explain emission lines and disks
- find spectroscopic data
- contribute amateur spectroscopy
Hazards and failure modes required Filled
- Confusing classical Be and Herbig Be stars
- Overinterpreting single spectra
Standards and interfaces required Filled
- MK spectral classification
Context of use required Filled
- 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 Filled
- Wikidata item Q812800: Be-type star - identity and sense of the item
- Wikipedia: Be star - general description of the item
Open questions
- Should subclasses be separate entries?
- How should spectra databases be linked?
- How should binarity be recorded?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q812800/spec.json