用Raven进行的簇一瞥：AO校正的Glimpse C01和Glimpse C02的近红外和中红外图像
Cluster Glimpses with Raven: AO Corrected Near and Mid-Infrared Images of Glimpse C01 and Glimpse C02
摘要：
我们讨论了斯巴鲁IRCS记录的星团GLIMPSE C01（GC01）和GLIMPSE C02（GC02）的图像。波前的畸变用RAVEN自适应光学（AO）科学演示仪进行了校正，使两个星团中心区域的个别恒星-非星团物体的污染率最低-得以成像。除了J、H和K '的图像外，两个星团都是通过一个中心在3.05 μ m附近的窄带滤光片观察到的; GC01也是通过另外两个窄带滤光片观察到的。窄带图像中的恒星具有接近望远镜衍射极限的FWHM，这表明像RAVEN这样的开环AO系统可以提供出色的图像质量。GC01的近红外色星等图被非均匀消光模糊，色散为± 0.13星等（A_K）。在GC01的K光度函数（LF）中发现了红团，距离模为13.6，与年龄大于1 Gyr的恒星组成的系统一致。至于GC02，当K> 16时，K LF是平坦的，如果星团距离约为7 kpc，则没有次巨星分支，这与年老的说法不符。星系团的SPITZER [3.6]和[4.5]存档图像也被检查，红巨星分支尖端被识别出来。
英文摘要：
We discuss images of the star clusters GLIMPSE C01 (GC01) and GLIMPSE C02 (GC02) that were recorded with the Subaru IRCS. Distortions in the wavefront were corrected with the RAVEN adaptive optics (AO) science demonstrator, allowing individual stars in the central regions of both clusters -- where the fractional contamination from non-cluster objects is lowest -- to be imaged. In addition to J, H, and K' images, both clusters were observed through a narrow-band filter centered near 3.05um; GC01 was also observed through two other narrow-band filters that sample longer wavelengths. Stars in the narrow-band images have a FWHM that is close to the telescope diffraction limit, demonstrating that open loop AO systems like RAVEN can deliver exceptional image quality. The near-infrared color magnitude diagram of GC01 is smeared by non-uniform extinction with a dispersion +/- 0.13 magnitudes in A_K. The Red Clump is identified in the K luminosity function (LF) of GC01, and a distance modulus of 13.6 is found. The K LF of GC01 is consistent with a system that is dominated by stars with an age > 1 Gyr. As for GC02, the K LF is flat for K > 16, and the absence of a sub-giant branch argues against an old age if the cluster is at a distance of ~ 7 kpc. Archival SPITZER [3.6] and [4.5] images of the clusters are also examined, and the red giant branch-tip is identified.
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