Home > Astronomy, General Astronomy, Globular Clusters, Stars > NOAO: A Better View With Adaptive Optics Into The Heart Of A Globular Cluster

NOAO: A Better View With Adaptive Optics Into The Heart Of A Globular Cluster


Astronomers at the Southern Observatory for Astrophysical Research (SOAR) and the Cerro Tololo Inter-American Observatory (CTIO) have demonstrated the significant difference that sharp stellar images can make in our understanding of the properties of stars. They have observed the globular cluster NGC 6496 using a new instrument dubbed SAM, for SOAR Adaptive Module, which creates an artificial laser guide star. SAM, built by CTIO/NOAO-S, is mounted on the SOAR 4.1 meter telescope.

From the surface of the earth, stars twinkle as their image wobbles around due to the effects of the Earth’s atmosphere, rather like observing a penny on the bottom of a swimming pool. By removing this wobble, using an adaptive optics system that utilizes a laser guide star, the stellar images are sharpened, and fainter stars appear. The accompanying figure shows this globular cluster, and the difference between the image of NGC 6496 with the artificial laser-produced guide star turned on and off. Turning on the artificial guide star allows the effect of the atmosphere to be determined so that the adaptive optical system can sharpens the image.

Full Story: http://www.noao.edu/news/2013/pr1304.php

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