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physical object > natural object > celestial body > collection of stars > association > OB association

OB association
subject			fact

OB association	has definition A loose gathering of O and B stars that typically stretches over hundreds of light-years and contains a few dozen OB stars.
	is a kind of association
association	has most luminous member
collection of stars	has number of stars
	has catalog catalog about star systems
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of OB association :

• Carina OB 2 (3 facts) - A rich association of OB stars near η Carinae.
• h and Chi Persei (8 facts) (Perseus OB1, double cluster in Perseus) - A double stellar association. It contains many young O and B stars and also many M supergiants.
• Perseus OB2 (3 facts) - A young association of OB stars.
• Scorpius OB1 (4 facts) - An extremely young association of OB stars.