Measurements of atmospheric turbulence parameters at Vainu Bappu Observatory using short-exposure CCD images

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2019,（5）
• 页码范围: 123-132
• 页数: 10页
• 语种: 英文
• DOI: 10.1088/1674-4527/19/5/74

摘要

We report atmospheric turbulence parameters,namely atmospheric seeing,tilt-anisoplanatic angle (θ0) and coherence time (τ0),measured under various sky conditions,at Vainu Bappu Observatory in Kavalur.Bursts of short exposure images of selected stars were recorded with a high-speed,frame-transfer CCD mounted on the Cassegrain focus of a newly commissioned 1.3 m telescope.The estimated median seeing is ≈ 1.85" at wavelength of ～ 600 nm,the image motion correlation between different pairs of stars is ～ 44％ for θ0 ≈ 36" and mean τ0 is ≈ 2.4 ms.This work was motivated by the design considerations and expected performance of an adaptive optics system that is currently being planned for the telescope.