OVI in the Local Interstellar Medium: FUSE observations towards B-stars within 200 pc

Physics

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Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, X-Ray Sources, X-Ray Bursts

Scientific paper

We present FUSE archival data on the absorption characteristics of the interstellar OVI (1032 A˚) line observed towards 17 early-type stars located within 200 pc of the Sun. We have detected OVI absorption along 5 of the 17 sight-lines sampled, all towards stars with distances >80 pc. The average volume density, nOVI, along these sight-lines was found to be 5.2×10-8 cm-3, a value in agreement with previous measurements of OVI in the local ISM. The location of the five sight-line detections places them just within, or just at, the neutral boundary to the Local Cavity.

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