SPECKLE INTERFEROMETRY OF BINARY AND MULTIPLE SYSTEMS IN OPEN CLUSTERS

The study of the binary and multiple star population in open clusters represents an important field of research in stellar astrophysics. However, the H-R diagram is afected if these stars are not taken into account, since the color dispersion among the stars in the CMD along the main sequence is due in part to a large population of unresolved binary stars. But this problem cannot be solved by classical photometry because this technique does not have enough spatial resolution. One solution to this problem can be based on speckle interferometry, a technique that allows high-precision astrometric measurements for binary stars: angular separation and position angle.