binary star
Let an agent handle binary stars by type, components, orbit and detection method, and keep components distinct.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent handle binary stars by type, components, orbit and detection method, and keep components distinct.
A system of two stars orbiting their common centre of mass, including visual, spectroscopic, eclipsing and X-ray binaries.
What it is for: Binaries provide the most direct measurements of stellar masses and host exotic phenomena.
It can be detect it, by imaging, spectra or eclipses; measure its orbit and masses; catalogue its components; study interactions, such as mass transfer.
Distinguishing features
Gravitationally bound, unlike optical doubles
Detection method defines the type
Interacting binaries can transfer mass
X-ray binaries include a compact object
What it looks like
Sometimes two points of light close together in a telescope; often only revealed by periodic dimming or spectral shifts.
Physical character
orbital period: minutes to thousands of years time
How it is recognised
Two resolved stars sharing motion
Periodic eclipses in light curves
Optical doubles look close but are not bound
Related models
is made of - two components
can include - X-ray binaries
is confused with - chance alignment
is a kind of - multiple system
In practice
Families and kinds
visual binaries
spectroscopic binaries
eclipsing binaries
X-ray binaries and microquasars
contact binaries
Identifiers
WDS designation Washington Double Star catalogue double stars
component suffix A, B components
Standards and regulation
IAU nomenclature
Failure modes and hazards
Merging components into one star
Mistaking an optical double for a binary
Also called
+15
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Components The two stars.
Components must be kept apart.
Stars
A and B.
Components
The component stars.
- What are the two components, and their types? definition
- Are there further companions? boundary
Masses
Mass measurements.
Masses
Component masses.
- What are the component masses, and how were they measured? measurement
- What is the mass ratio? measurement
Orbit How they move.
Orbit gives the physics.
Elements
Period and separation.
Orbit
Orbital elements.
- What are the period and separation? measurement
- How eccentric is the orbit? measurement
Interaction
Mass transfer.
Interaction
Interaction status.
- Are the stars interacting? definition
- What phenomena result? definition
Detection How it is known.
Detection defines the type.
Method
Visual, spectroscopic, eclipsing.
Method
Detection method.
- How was the binary detected? provenance
- Is it confirmed? boundary
Data
Catalogues.
Data
Catalogue entries.
- Which catalogues list it? provenance
- How current are the orbital data? provenance
Observation Seeing it.
Some binaries are good targets.
Visibility
Resolvable?
Visibility
Whether resolvable.
- Can the pair be resolved with amateur equipment? boundary
- When is it visible? measurement
Variability
Eclipses.
Variability
Eclipse schedule.
- When are eclipses predicted? measurement
- How deep are they? measurement
What the second pass must settle
- How should components be represented as separate entries?
- How should detection methods be recorded?
- How should higher-order multiples be modelled?