前MS恒星比我们想象的要老吗？
Are pre-MS stars older than we thought?
摘要：
我们提出了一个一致的年龄排序的年轻的集群和集团确定使用收缩的恒星通过其前主序星阶段。我们将这些与来自上部主序星演化的年龄进行比较，发现上部MS年龄老了1.5到2倍。我们发现，增加的二进制分数和数量之间的O-星相比，其余的MS的等质量的二进制不能消除这种差异。
英文摘要：
We present a consistent age ordering for young clusters and groups determined using the contraction of stars through their pre-main-sequence phase. We compare these with ages derived from the evolution of the upper main-sequence stars, and find the upper MS ages are older by a factor 1.5 to 2. We show that increasing the binary fraction and number of equal-mass binaries amongst the O-stars compared to the rest of the MS cannot remove this discrepancy.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
