Chandra Cygnus OB2 Legacy Survey: X-ray Catalog

The Cygnus OB2 association is the largest concentration of young and massive stars within 2kpc of the Sun, including an estimated 65 O-type stars and hundreds of OB stars. The...天鹅座OB2星协（Cygnus OB2）是太阳周边2千秒差距范围内规模最大的年轻大质量恒星集聚体，据估算其中包含65颗O型星以及数百颗OB型星。