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Date: | 14.10.01 | Time: | 0:25 UT | Exposure: | 30 min |
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Field of View: | 4.2o x 5.3o | Emulsion: | Kodak Ektachrome 200/400 | Filter: | none |
Instrument: | f=300mm 1/4.5 | Place: | Römerstein, Alb | Observer: | Till Credner |
This loose type of open cluster is also called an OB-Association since the clustered stars are mainly of the young, massive, and hot spectral types O and B. These associations are quite instable and have short lifetimes before they evaporate into space.
See also: