Does the Line of Sight to M5 Intersect a Highly-Ionized High-Velocity Cloud?

Details Does the Line of Sight to M5 Intersect a Highly-Ionized High-Velocity Cloud? Does the Line of Sight to M5 Intersect a Highly-Ionized High-Velocity Cloud?

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..348..218d&link_type=abstract

Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE ASP Conference Series, Vol. 348, Proceedings of the Confe

Astronomy and Astrophysics

Astrophysics

Scientific paper

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-1, 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 high-ionization 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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