Computer Science
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2345..311r&link_type=abstract
In NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81 p 311-314 (SEE N85-15539 06-90)
Computer Science
3
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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