英仙座的双星团
(原标题: A Double Star Cluster in Perseus)
2022-11-22
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很少有星团彼此如此接近。公元前130年，希腊天文学家喜帕恰斯（Hipparchus）在黑暗的天空中肉眼可见。大约7000光年之外，这对疏散星团也是一个容易的双目观测目标，它是希腊神话英雄英仙座北部星座的一个引人注目的星场。现在被称为英仙座h和chi，或NGC 869（右上）和NGC 884，这两个星团本身相距只有几百光年，其中的恒星比太阳年轻得多，温度也高得多。除了物理上靠得很近之外，这两个星团的年龄基于它们各自的恒星是相似的——这表明两个星团很可能是同一个恒星形成区域的产物。
查看原文解释
Few star clusters are this close to each other. Visible to the unaided eye from dark sky areas, it was cataloged in 130 BC by Greek astronomer Hipparchus. Some 7,000 light-years away, this pair of open star clusters is also an easy binocular target, a striking starfield in the northern constellation of the mythical Greek hero Perseus. Now known as h and chi Persei, or NGC 869 (above right) and NGC 884, the clusters themselves are separated by only a few hundred light-years and contain stars much younger and hotter than the Sun. In addition to being physically close together, the clusters' ages based on their individual stars are similar - evidence that both clusters were likely a product of the same star-forming region.
© Tommy Lease