Rotation periods of Orion PMS stars

We report rotation periods for 254 stars in an area 40'x80' centered on the Orion Nebula. We show that these stars are likely members of the young (~10^6^yr) Orion OBIc/d...本研究报道了以猎户座星云（Orion Nebula）为中心、覆盖40角分×80角分天区的254颗恒星的自转周期。我们证实，这些恒星大概率属于年龄约为10^6年的猎户座OB1c/d星协……