Orion OB association

E459015

OB association stellar association

The Orion OB association is a nearby stellar grouping dominated by young, massive O- and B-type stars in the Orion constellation, serving as a key region for studying recent star formation in our galactic neighborhood.

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Observed surface forms (2)

Surface form	Occurrences
Orion OB1 association	6
Orion OB1b subgroup	2

Statements (49)

Predicate	Object
instanceOf	OB association ⓘ stellar association ⓘ
affects	surrounding molecular clouds ⓘ
age	a few million years ⓘ
ageRange	approximately 1–12 million years ⓘ
associatedWith	Orion A molecular cloud NERFINISHED ⓘ Orion B molecular cloud NERFINISHED ⓘ
contains	T Tauri stars ⓘ pre-main-sequence stars ⓘ young massive stars ⓘ
containsObject	Flame Nebula region NERFINISHED ⓘ Horsehead Nebula region NERFINISHED ⓘ NGC 1977 NERFINISHED ⓘ Orion Nebula (M42) NERFINISHED ⓘ
containsRegion	Orion Belt region NERFINISHED ⓘ Orion Sword region NERFINISHED ⓘ
containsSubgroup	Orion OB1a subgroup NERFINISHED ⓘ Orion OB1b subgroup NERFINISHED ⓘ Orion OB1c subgroup NERFINISHED ⓘ Orion OB1d subgroup NERFINISHED ⓘ
distanceFromEarth	approximately 1100–1500 light-years ⓘ approximately 350–450 parsecs ⓘ
dominantStellarTypes	B-type stars ⓘ O-type stars ⓘ
hasAlternativeName	Orion OB1 association NERFINISHED ⓘ
hasBeenStudiedUsing	X-ray observations ⓘ infrared observations ⓘ optical observations ⓘ radio observations ⓘ
hasKinematicProperty	expanding stellar groups ⓘ
hasStarFormationHistory	sequential star formation ⓘ
importance	prototype OB association in the solar neighborhood ⓘ
influences	interstellar medium in Orion region ⓘ
isNearby	Sun NERFINISHED ⓘ
isPartOf	local spiral arm (Orion Arm) NERFINISHED ⓘ
locatedIn	Milky Way ⓘ
locatedInConstellation	Orion NERFINISHED ⓘ
partOf	Orion molecular cloud complex NERFINISHED ⓘ
radiationField	strong ultraviolet radiation from OB stars ⓘ
roleInAstrophysics	important region for studying massive star formation ⓘ important region for studying triggered star formation ⓘ key laboratory for studying recent star formation ⓘ
skyLocation	near celestial equator ⓘ
stellarPopulation	massive OB stars ⓘ predominantly young stars ⓘ
subdividedInto	Orion OB1 association NERFINISHED ⓘ
usedToStudy	feedback from massive stars on molecular clouds ⓘ initial mass function of young stellar populations ⓘ
visibility	visible from both hemispheres ⓘ