A search for peculiar objects in young open clusters - II. A new Be star, the optical counterpart of IRAS 19564+3224 and a new open cluster in Vulpecula

A serendipitous sky field in Vulpecula was observed with Johnson BVR photom etry and slitless spectroscopy in the 5600-8000 Angstrom range, looking for emission line and late spectral type stars. We discovered that the B2V sta r LS II +32 degrees 9, most probably a member of the Vul OB4 association, i s now an H alpha emitter. Furthermore, we identified the optical counterpar t of the IRAS source IRAS 19564+3224 as a C star. Photometric study of the surrounding stellar field revealed that this object lies inside the sky are a of a previously undetected open cluster of intermediate age. We discuss t he possible cluster membership of the Carbon star and its implications. Som e hints about the galactic structure along the line of sight of the observe d field are also given.