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Stromgren Trails of Hot White Dwarfs

Published online by Cambridge University Press:  12 April 2016

John C. Raymond
John C. Raymond*
Affiliation:
Harvard-Smithsonian Center for Astrophysics

Abstract

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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.

Type
Theoretical Models
Information
International Astronomical Union Colloquium , Volume 81: Local Interstellar Medium , 1984 , pp. 311 - 314
Copyright
Copyright © NASA 1984

References

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