SPECKLE INTERFEROMETRY OF SOUTHERN DOUBLE STARS .1. FIRST RESULTS OF THE YALE SAN-JUAN SPECKLE INTERFEROMETRY PROGRAM

We present position angle and separation measures for 60 double stars from speckle observations at El Leoncito, Argentina between 1994 July and 1995 February, The data were taken with a multianode microchannel array (MAMA) detector system, which we have on long term loan from J. G. Timothy of the University of New Brunswick, Canada. Most of the obs ervations were performed on the 76-cm telescope at the Cesco Observato ry, but others were taken using the 2.15-m telescope at Complejo Astro nomico El Leoncito. The method of deducing position angle and separati on measures from the raw data is a weighted least-squares fit to the o bject spatial frequency power spectrum. The position angle ambiguity i nherent in power spectrum analysis is resolved in most cases by comput ing the directed vector autocorrelation of Bagnuolo et al. [Proc. SPIE , 1237, 286 (1990); AJ, 103, 1399 (1992)], and in the remaining cases by performing a full speckle imaging analysis. (C) 1996 American Astro nomical Society.