Abstract
ABSTRACTWe 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.
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