OB association

'OB association' can also refer to...

OB association

ASCA Observation of Cygnus OB2 Association

X-Ray Observations of the Orion OB1b Association

Study of Eclipsing Binary and Multiple Systems in OB Associations. I. Orion OB1a- IM Monocerotis

Cygnus OB2 DANCe: A high-precision proper motion study of the Cygnus OB2 association

A very massive spectroscopic binary in the LH 54 OB association in the Large Magellanic Cloud

The stellar association around Gamma Velorum and its relationship with Vela OB2

Observation of the Cygnus OB2 Association with Suzaku and Long-Term Light Curves

MY Serpentis: a high-mass triple system in the Ser OB2 association★

Long-baseline interferometric multiplicity survey of the Sco–Cen OB association

Constraints on massive star formation: Cygnus OB2 was always an association

Star formation in unbound giant molecular clouds: the origin of OB associations?

Kinematics of OB-associations and the new reduction of the Hipparcos data

Ultra-high-resolution observations of interstellar Na i and K i towards the Scorpius OB1 association

Early-A stars from IPHAS, and their distribution in and around the Cyg OB2 association

The star formation history and accretion-disc fraction among the K-type members of the Scorpius–Centaurus OB association

The massive eclipsing system ALS 1135 and variable stars in the field of the distant OB association Bochum 7

Chandra X-ray observations of the young stellar cluster NGC 6193 in the Ara OB1 association

The massive star binary fraction in young open clusters – III. IC 2944 and the Cen OB2 association


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A group of dozens of young, massive, and hot stars of spectral types O and B found in the spiral arms of galaxies. OB associations can be tens or hundreds of light years across. The stars are moving apart at several kilometres per second, so associations disperse among the background stars within about 30 million years. Famous examples are the Orion Association and the Sco–Cen Association.

Subjects: Astronomy and Astrophysics.

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