1998PASP..110..827W

We present results from extended pointings of the EUVE scanner telescopes in the direction of the rarefied interstellar tunnel toward the star β CMa. Five sources were detected, each of which subsequently proved to be caused by ultraviolet leaks in the EUVE short-wavelength filters. Our initial expectation was to detect many new EUV sources in the 80 deg² region of very low neutral interstellar hydrogen column density covered by these extended pointings. However, no EUV sources were detected. This result is consistent with a source of short-wavelength EUV opacity, providing indirect evidence for the presence of highly ionized (coronal) gas at distances of more than 5 pc in the line of sight toward this region of anomalous interstellar absorption.