High-resolution IUE observations of interstellar absorption lines in the VELA supernova remnant

Details High-resolution IUE observations of interstellar absorption lines in the VELA supernova remnant High-resolution IUE observations of interstellar absorption lines in the VELA supernova remnant

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..649j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 15, 1984, p. 649-662.

Astronomy and Astrophysics

Astrophysics

66

Interstellar Matter, Nebulae, Stellar Spectra, Supernova Remnants, Ultraviolet Spectra, Absorption Spectra, Abundance, Carbon, Interstellar Gas, Ionized Gases, Iue, Radial Velocity, Velocity Distribution

Scientific paper

Ultraviolet spectra of 45 stars in the vicinity of the Vela supernova remnant were recorded by the short-wavelength echelle spectrograph aboard the International Ultraviolet Explorer (IUE). Over one-third of the stars show interstellar absorption lines at large radial velocities (greater than 60 km/s). The mapping of these high-velocity components in the sky suggests the motions are chaotic, rather than from a coherent expansion of the remnant material. In accord with earlier conclusions from Copernicus data, the gas at high velocity exhibits higher than normal ionization and shows substantially less depletion of nonvolatile elements than normal interstellar material at low velocities. Relatively strong lines from neutral carbon in the two excited fine-structure states indicate that the neutral clouds within the remnant have had their pressures enhanced by the passage of the blast wave from the supernova. Also, the remnant seems to show a significant enhancement in the abundances of low-velocity Si IV, C IV, and N V over those found in the general interstellar medium.

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