Trumpler 14的MAD视图
A MAD view of Trumpler 14
摘要：
本文介绍了利用ESO多共轭自适应光学演示器MAD对船底座区Tr 14星系团核心进行的自适应光学（AO）近红外观测。我们的活动产生AO校正的意见，图像质量约0.2 arcsec在2弧分的视野，这是有史以来最广泛的AO马赛克。我们检测到近2000个源跨越动态范围为10马格。前主序（PMS）轨迹的颜色星等图是很好地再现Palla & Stahler等时线的年龄为3至5 1 E +05年，确认非常年轻的年龄集群。我们得到了一个非常高的（去投影的）中心密度n 0 ~4.5（+/-0.5）\times 10^4 pc^-3，并估计该星团的总质量约为~4.3^{+3.3}_{-1.5} \times 10^3 Msun，尽管视场的污染可能对所得到的质量有显著的影响。我们发现，配对过程主要是由机会对齐，使物理对是很难从虚假的基础上，我们的单历元观测解开。然而，我们确定了150个可能的结合对，其中30%的分离小于0.5 arcsec（~ 1300 AU）。我们进一步表明，在2-sigma水平的大质量恒星有更多的同伴比低质量的恒星，这些同伴分别是平均更亮，因此更大的质量。最后，我们发现一些线索的质量分离的恒星重约10 Msun。如果得到证实，观测到的质量分离程度可以用动力学演化来解释，尽管星系团的年龄很小。
英文摘要：
We present adaptive optics (AO) near-infrared observations of the core of the Tr 14 cluster in the Carina region obtained with the ESO multi-conjugate AO demonstrator, MAD. Our campaign yields AO-corrected observations with an image quality of about 0.2 arcsec across the 2 arcmin field of view, which is the widest AO mosaic ever obtained. We detected almost 2000 sources spanning a dynamic range of 10 mag. The pre-main sequence (PMS) locus in the colour-magnitude diagram is well reproduced by Palla & Stahler isochrones with an age of 3 to 5 1E+05 yr, confirming the very young age of the cluster. We derive a very high (deprojected) central density n0~4.5(+/-0.5) \times 10^4 pc^-3 and estimate the total mass of the cluster to be about ~4.3^{+3.3}_{-1.5} \times 10^3 Msun, although contamination of the field of view might have a significant impact on the derived mass. We show that the pairing process is largely dominated by chance alignment so that physical pairs are difficult to disentangle from spurious ones based on our single epoch observation. Yet, we identify 150 likely bound pairs, 30% of these with a separation smaller than 0.5 arcsec (~1300AU). We further show that at the 2-sigma level massive stars have more companions than lower-mass stars and that those companions are respectively brighter on average, thus more massive. Finally, we find some hints of mass segregation for stars heavier than about 10 Msun. If confirmed, the observed degree of mass segregation could be explained by dynamical evolution, despite the young age of the cluster.
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