IMAGING SPECTROSCOPY WITH HIGH-SPATIAL-RESOLUTION

The application of the speckle interferometric technique to spectrosco pic observation enables us to obtain the objective spectrum of a stell ar object with high spatial resolution under atmospheric turbulence. I n our method an object and its spectrum are reconstructed with high sp atial resolution from the speckle interferograms and their dispersed s pecklegrams which are simultaneously recorded. The method is applied t o observations of binary stars, of which spectra are hardly separated spatially by ordinary spectroscopic methods. The reconstructed spectra of phi And, a binary star of angular separation of 0.53'' reveal that the primary star has an Halpha emission line, while the secondary has an Halpha absorption line. The reconstructed image of phi And along w ith the objective spectra clearly shows that our method affords imagin g spectroscopy with high spatial resolution.