Abstract Details
| Name: Sreekanth Reddy V Affiliation: Indian Institute of Astrophysics Conference ID: ASI2016_710 Title : Estimation of the atmospheric turbulence parameters using short exposure images with 1.3m telescope at Kavalur Authors and Co-Authors : Sreekanth Reddy V, Ravinder K Banyal, P.Anbazhagan, R. Sridharan, B. Ravindra Abstract Type : Poster Abstract Category : Instrumentation and Techniques Abstract : Atmospheric turbulence limits the ability of the ground based telescopes to form diffraction limited images. In order to develop high resolution imaging system, the estimation of the turbulence parameters, such as the Fried's parameter r0, isoplanatic angle, tilt-anisoplanatism between the objects and the coherence time are crucial. Turbulence parameters can be estimated by obtaining short exposure images with a high speed imager. In this paper, I will present our methodology and results of focal plane image motion of stars used to estimate the turbulence parameters with 1.3m telescope at Kavalur. A high speed camera (Princton, ProEM) was used to acquire bright star images of magnitude 6 or better in R band, for observations spanning nearly a year. Stars with different angular separations were chosen to estimate the image motion correlation in the telescope focal plane. We estimate the median r0 to be 12.5 cm ( seeing 1.3'' ). We also find that turbulence induced motion of the stars is strongly correlated (up to 75%) for pair of stars separated by 30''. These parameters will be used in designing a tip/tilt adaptive optics system for the telescope. |