Hot giant star group From Wikipedia, the free encyclopedia
The Orion OB1 stellar association is the group of hot giant stars in a large cluster. They are spectral types O and B. There are thousands of lower-mass stars also in this group, and some protostars.
The association is part of the larger Orion Molecular Cloud Complex. It is the most closely studied OB association.[1]
The Orion OB1 association has these subgroups:[1][2]
Signs of stellar debris disk have been found in the 1a and 1b subgroups. That is a circumstellar disk of dust and debris in orbit around a star.[7][8]
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