sigma Ori GTC+INT spectroscopy
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Only a few open clusters are as important for the study of stellar and substellar objects, and their formation and evolution, as the young sigma Orionis cluster. However, a...
在恒星与亚恒星天体及其形成与演化的研究领域中，仅有少数疏散星团（open clusters）的重要性可与年轻的猎户座σ星团（sigma Orionis cluster）相提并论。然而，一项……
