Stromgren trails of hot white dwarfs
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. It was 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 nonequilibrium ionization models are required. Models of the resulting elongated trails are presented.
- Research Organization:
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA)
- OSTI ID:
- 5749892
- Report Number(s):
- N-85-15589
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
COSMIC RADIATION
DWARF STARS
INTERSTELLAR SPACE
IONIZATION
IONIZING RADIATIONS
RADIATIONS
SPACE
SPECTRA
STARS
STELLAR ACTIVITY
STELLAR WINDS
WHITE DWARF STARS