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首页> 外文期刊>The Astrophysical journal >ON THE LUMINOSITY FUNCTION, LIFETIMES, AND ORIGIN OF BLUE STRAGGLERS IN GLOBULAR CLUSTERS
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ON THE LUMINOSITY FUNCTION, LIFETIMES, AND ORIGIN OF BLUE STRAGGLERS IN GLOBULAR CLUSTERS

机译：团簇中蓝色条纹的发光功能，寿命和起源

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摘要

We compute theoretical evolutionary tracks of blue stragglers created by mergers. Two formation scenarios are considered: mergers of primordial binaries, and stellar collisions. These two scenarios predict strikingly different luminosity functions, which are potentially distinguishable observationally. Tabulated theoretical luminosity functions and lifetimes are presented for blue stragglers formed under a variety of input conditions. We compare our results with observations of the blue straggler sequences in 47 Tucanae and M3. In the case of 47 Tuc, the luminosity function and the formation rate are compatible with the hypothesis that the blue stragglers formed through the collision of single stars. Mergers of primordial binaries are only marginally con-sistent with the data, and a significant enhancement of the collision cross section by binary-single-star encounters appears to be ruled out. In the case of M3, we find that the innermost blue stragglers have a luminosity function significantly different from that of the outer stragglers, thus confirming earlier suggestions that there are two distinct populations of blue stragglers in this cluster. The inner stragglers are preferentially brighter and bluer, as would be expected if they were made by collisions, but there are so many of them that the collision rate would need to be enhanced by interactions involving wide binaries. The luminosity function of the outer stragglers is almost identical to the predictions of mergers from primordial binaries and is inconsistent with the collision hypothesis.
机译：我们计算合并产生的蓝色散乱者的理论演化轨迹。考虑了两种形成方案：原始二进制文件的合并和恒星碰撞。这两种情况预测的光度函数显着不同，这在观察上可能是可区分的。表中列出了在各种输入条件下形成的蓝色散光器的理论光度函数和寿命。我们将我们的结果与对47个杜卡尼和M3的蓝色散布序列的观察结果进行比较。在47 Tuc的情况下，其光度函数和形成速度与蓝色散光子通过单颗恒星碰撞形成的假设是相容的。原始双星的合并仅与数据保持一定程度的一致性，并且似乎排除了双星－单星相遇对碰撞横截面的显着增强。在M3的情况下，我们发现最里面的蓝色散乱者的光度函数与外部散乱者的光度函数显着不同，因此证实了较早的建议，即该簇中有两个不同的蓝色散乱者。内部散流器优先变亮和变蓝，就像通过碰撞产生的那样，但是它们太多，以至于需要通过涉及宽二进制的交互来提高碰撞率。外部散乱者的光度函数几乎与原始二进制合并的预测相同，并且与碰撞假说不一致。

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