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Title:
Ultraviolet Absorption Lines from High-Velocity Gas in the VELA Supernova Remnant: New Insights from Space Telescope Imaging Spectrograph Echelle Observations of HD 72089
Authors:
Jenkins, Edward B.; Tripp, Todd M.; Fitzpatrick, Edward L.; Lindler, Don; Danks, Anthony C.; Beck, Terrence L.; Bowers, Charles W.; Joseph, Charles L.; Kaiser, Mary Elizabeth; Kimble, Randy A.; Kraemer, Stephen B.; Robinson, Richard D.; Timothy, J. Gethyn; Valenti, Jeff A.; Woodgate, Bruce E.
Publication:
Astrophysical Journal Letters v.492, p.L147 (ApJL Homepage)
Publication Date:
01/1998
Origin:
APJ
ApJ Keywords:
ISM: ABUNDANCES, ISM: INDIVIDUAL NAME: VELA SUPERNOVA REMNANT, ISM: KINEMATICS AND DYNAMICS, SHOCK WAVES, STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 72089, ISM: SUPERNOVA REMNANTS
DOI:
10.1086/311114
Bibliographic Code:
1998ApJ...492L.147J

Abstract

The star HD 72089 is located behind the Vela supernova remnant and shows a complex array of high- and low-velocity interstellar absorption features arising from shocked clouds. A spectrum of this star was recorded over the wavelength range 1196.4-1397.2 A at a resolving power of lambda / Delta lambda = 110,000 and a signal-to-noise ratio of 32 by the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. We have identified seven narrow components of C I and have measured their relative populations in excited fine-structure levels. Broader features at heliocentric velocities ranging from -70 to 130 km s-1 are seen in C II, N I, O I, Si II, S II, and Ni II. In the high-velocity components, the unusually low abundances of N I and O I, relative to S II and Si II, suggest that these elements may be preferentially ionized to higher stages by radiation from hot gas immediately behind the shock fronts.
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