Spectroscopy in the 25 Ori group

We report here on the photometric and kinematic properties of a well-defined group of nearly 200 low-mass pre-main-sequence stars, concentrated within ~1{deg} of the early-B...本文报道了一组界定明确的近200颗低质量主序前恒星（pre-main-sequence stars）的测光与运动学特性，该类恒星集中于早B型星天区约1度的范围内