30 Dor电离星团中大质量双星的Gemini/GMOS搜寻
Gemini/GMOS search of massive binaries in the ionizing cluster of 30 Dor
摘要：
如果双星在大质量恒星中很常见，它将对星系团年龄、IMF和动力学质量等基本性质的推导产生重要影响。利用双子座多目标摄谱仪（GMOS）的多路复用设备，我们能够调查电离星团剑鱼座30内是否存在双星。从七个时代的观测活动在南双子座，我们发现一个二元候选人率约为50%，这是一致的内在100%的大质量恒星之间的二元率。我们发现，单历元的速度色散的测定值约为30公里/秒。在对双星轨道运动的整体速度色散进行修正后，星团的真实速度色散为8.3 km/s。这个值意味着维里质量约为4.5E5 Msun或使用单历元值计算的质量的8%。二元修正维里质量的估计与光度测定的质量一致，因此表明NGC 2070是未来球状星团的坚定候选者。
英文摘要：
If binaries are common among massive stars, it will have important consequences for the derivation of fundamental properties like the cluster age, IMF and dynamical mass. Making use of the multiplexing facilities of Gemini Multi Object Spectrograph (GMOS) we were able to investigate the presence of binary stars within the ionising cluster of 30 Doradus. From a seven epochs observing campaign at Gemini South we detect a binary candidate rate of about 50%, which is consistent with an intrinsic 100% binary rate among massive stars. We find that single epoch determinations of the velocity dispersion give values around 30 km/s . After correcting the global velocity dispersion for the binary orbital motions, the true cluster velocity dispersion is 8.3 km/s. This value implies a virial mass of about 4.5E5 Msun or 8 percent of the mass calculated using the single epoch value. The binary corrected virial mass estimate is consistent with photometric mass determinations thus suggesting that NGC 2070 is a firm candidate for a future globular cluster.
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