open cluster

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open cluster:

see star clusterstar cluster,
a group of stars near each other in space and resembling each other in certain characteristics that suggest a common origin for the group. Stars in the same cluster move at the same rate and in the same direction.
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open cluster

(galactic cluster) A loose cluster of stars that contains at most a few thousand stars and sometimes fewer than twenty. Examples visible to the naked eye are the Hyades and the Pleiades. About 1200 open clusters are known. They are population I systems and occur in or close to the plane of the Galaxy. The brightest stars in an open cluster can be either red or blue giants, depending upon its age. Stars in the older clusters, such as M67 in Cancer, are similar in appearance to those in globular clusters, although with some subtle differences due to the higher metal content of the material from which they were formed. Open clusters are more loosely bound systems than globular clusters and they tend to be gradually dispersed by the combined effects of the differential rotation of the Galaxy and perturbations due to close encounters with interstellar clouds. Calculations suggest that many will not survive more than one or two circuits of the Galaxy. Hence most open clusters are comparatively young systems. Some, such as NGC 2264, are less than 10 million years old and in these clusters star-formation is probably still taking place (see OB cluster). See also Hertzsprung–Russell diagram; moving cluster; turnoff point.

open cluster

[′ō·pən ′kləs·tər]
(astronomy)
One of the groupings of stars that are concentrated along the central plane of the Milky Way; most have an asymmetrical appearance and are loosely assembled, and the stars are concentrated in their central region; they may contain from a dozen to many hundreds of stars. Also known as galactic cluster.
References in periodicals archive ?
It is one of the most spectacular open star clusters in the whole sky.
Named after the astronomical open star cluster of the same name, NASA's Pleiades system now consists of three generations of SGI Altix ICE, three generations of Intel[R] Xeon[R] processor series, and two generations of InfiniBand, all managed as a single system, demonstrating the power and flexibility of Altix ICE to span multiple generations.
The open star cluster NGC 3231 is located in the far north of the constellation.
Their project was titled "A Search for Exoplanets in Open Star Clusters Using a Novel Photometric Algorithm for the 'Crippled' Kepler Mission.
These new results show that planets in open star clusters are about as common as they are around isolated stars -- but they are not easy to detect," said Luca Pasquini (ESO, Garching, Germany), co-author of the new paper.
The 88 papers presented during the July 2011 meeting share recent research on stellar pulsations, magnetic fields, mass loss and clumping in hot stellar winds, massive star wind models, massive binaries, young open star clusters, and massive star formation.
6 million light-years away, NASA Hubble Space Telescope's view is so sharp that it can resolve individual stars, along with open star clusters, globular star clusters, and even glowing regions of fluorescent gas.