STELLAR UVBY-BETA PHOTOMETRY IN 3 EUV SHADOW DIRECTIONS

We present the uvby beta data used to locate the dust and derive dista nces for nearby diffuse interstellar clouds in the EUV shadows lb27-31 , lb165-32 and lb329+46 discovered by the Extreme Ultraviolet Explorer . The photometrically derived parallaxes of our program stars are comp ared to the parallaxes listed in the Hipparcos Catalog. Within the pho tometric distance limit of 150 pc, the photometric parallaxes of 21 '' normal'' stars are consistent with the Hipparcos measurements within a n uncertainty of 15%. Much as expected for the Stromgren system. Since all program stars are brighter than V approximate to 11.5 most of the m are included in the Tycho photometry. For our sample of similar to 2 00 stars we find V-by and V-T to be consistent. Few stars are common t o published uvby beta catalogs, similar to 10, V and the indices compa re well apart from beta where a zero point difference of 11 mmag is no ticed(1).