Epsilon Canis Majoris: The Brightest EUV Source with Surprisingly Low Interstellar Absorption

J. Michael Shull, Rachel M. Curran, Michael W. Topping

The B2 star $\epsilon$ CMa, at parallax distance $d=124\pm 2$~pc, dominates the H I photoionization of the local interstellar cloud (LIC). At its closer parallax distance compared to pre…