Line Identification in the EUVE Spectrum of $\epsilon$ CMa

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Session 41 -- EUVE -- Astronomy
Display presentation, Tuesday, 6:00-8:00, CEA Room

[41.24] Line Identification in the EUVE Spectrum of $\epsilon$ CMa

D.H.Cohen, J.J.MacFarlane, J.P.Cassinelli (U. Wisconsin), J.V.Vallerga, P.W.Vedder, B.Y.Welsh (CEA/UCB), J.E. Drew, and M.G. Hoare (U. Oxford, UK)

The B2II star $\epsilon$ CMa shows spectral features in all three spectrometer bands of the EUVE satellite. The stellar continuum and stellar absorption lines are present in the long wavelength band. We identify numerous broadened wind absorption lines longward of the HeI 504\AA~ ionization edge. The edge itself appears to be displaced in the redward direction due to a confluence of OIII wind lines at 507\AA. In the medium wavelength band there appears strong emission in the HeII Ly$\alpha$ line, which is broadened in a manner consistent with the expected wind speed of an early B star. In addition there are lines from highly ionized species in the short wavelength band. The significance of the lines as diagnostics of the atmosphere and stellar wind is discussed.

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