Speckle interferometry at the observatorio astronómico nacional. VII

Abstract

The results of speckle interferometric measurements of binary stars performed during June, 2016 with the 2.1 m telescope at the Observatorio Astronómico Nacional at SPM (México) are given. We report 480 astrometric measurements of 468 double stars systems. The measured angular separations ρ range from 000.091 to 500.93. Most of the observed pairs (414 out of 468) are close double stars having separations of ρ ≤ 100. We confirm as double stars 59 targets and we found 3 new pairs with separation of less than 100. Finally, we show that the high resolution autocorrelation function in polar coordinates allows to easily recover astrometric parameters even in the presence of strong telescope aberrations.