Stromgren trails of hot white dwarfs

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Absorption Spectra, Hot Stars, Interstellar Matter, Nonequilibrium Ionization, Stellar Winds, White Dwarf Stars, Celestial Bodies, Cosmic X Rays, Ionizing Radiation, Solar Wind Velocity

Scientific paper

High resolution IUE spectra of Feige 24 reveal sharp C IV absorption features at both the stellar velocity and the velocity of the interstellar lines. Dupree and Raymond have shown that the ionization zone created by Feige 24 itself accounts for the interstellar components of C IV and Si IV, and that the density of hot white dwarfs in the galaxy implies that similar ionized zones around hot white dwarfs make a significant contribution to the C IV column densities observed toward distant O and B stars. Typical white dwarf velocities of around 30 km/s and C IV ionization zone diameters less than 1 pc imply that the crossing time is comparable to the ionization time, so that non-equilibrium ionization models are required. Models of the resulting elongated trails are presented.

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