Herbig Ae/Be stars
E459056
Herbig Ae/Be stars are young, intermediate-mass pre-main-sequence stars that are still contracting toward the main sequence and are often surrounded by gas and dust disks.
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
intermediate-mass star
ⓘ
pre-main-sequence star ⓘ young stellar object ⓘ |
| ageRange | approximately 1 to 10 million years ⓘ |
| approachingPhase | main sequence ⓘ |
| canShow |
accretion signatures
ⓘ
jets or outflows ⓘ stellar winds ⓘ |
| differenceFromTTauri |
earlier spectral type
ⓘ
higher mass ⓘ |
| discoveredBy | George Herbig NERFINISHED ⓘ |
| discoveryEpoch | 1960s ⓘ |
| diskRole | sites of possible planet formation ⓘ |
| evolutionaryStage | pre-main-sequence ⓘ |
| gasAccretionMechanism | magnetospheric or boundary-layer accretion ⓘ |
| HRDiagramLocation | above the main sequence ⓘ |
| infraredExcessCause | thermal emission from circumstellar dust ⓘ |
| luminosity | higher than main-sequence stars of same spectral type ⓘ |
| magneticActivity | can possess magnetic fields ⓘ |
| namedAfter | George Herbig NERFINISHED ⓘ |
| observedWith |
infrared telescopes
ⓘ
millimeter interferometers ⓘ |
| oftenAssociatedWith | reflection nebulae ⓘ |
| oftenLocatedIn |
molecular clouds
ⓘ
star-forming regions ⓘ |
| oftenShow |
P Cygni profiles
ⓘ
strong H-alpha emission ⓘ |
| relatedTo | T Tauri stars NERFINISHED ⓘ |
| rotation | moderate to rapid rotation ⓘ |
| showEmissionLines | true ⓘ |
| showInfraredExcess | true ⓘ |
| stillContracting | true ⓘ |
| surfaceTemperature | approximately 7,500 to 30,000 K ⓘ |
| surroundedBy |
dust disk
ⓘ
gas disk ⓘ protoplanetary disk ⓘ |
| typicalEmissionLines |
forbidden lines
ⓘ
hydrogen Balmer lines ⓘ |
| typicalEnvironment | clusters and associations ⓘ |
| typicalMassRange | 2 to 8 solar masses ⓘ |
| typicalSpectralType |
A
ⓘ
B ⓘ |
| usedToStudy |
disk evolution and dispersal
ⓘ
early stellar evolution of intermediate-mass stars ⓘ planet formation around intermediate-mass stars ⓘ |
| variability |
photometric variability
ⓘ
spectroscopic variability ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
NGC 6530