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| Paper: |
Does the Line of Sight to M5 Intersect a Highly-Ionized High-Velocity Cloud? |
| Volume: |
348, Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE |
| Page: |
218 |
| Authors: |
Dixon, W.V.; Brown, T.M.; Howk, J.C.; Landsman, W.B. |
| Abstract: |
FUSE and HST/STIS observations of the post-asymptotic giant branch (PAGB) star ZNG 1 in the globular cluster M5 (NGC 5904) reveal high-velocity absorption in O VI, C IV, Si IV, and other species. With LSR velocities between −150 and −100 km s, this complex of absorbing components is blue-shifted by roughly −180 km s−1 relative to the stellar photosphere. The absorption represents either circumstellar material (e.g., gas ejected during the star's AGB phase and now shock-heated by the fast PAGB wind) or a highionization high-velocity cloud (HVC) along the line of sight to M5. If the latter, it would be the first evidence that highly-ionized HVCs may be found near the Galactic disk. |
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