Bart P. Wakker

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We report the results of a FUSE study of high velocity O VI absorption along complete sight lines through the Galactic halo in directions toward 100 extragalactic objects and 2 halo stars. The high velocity O VI traces a variety of phenomena, including tidal interactions with the Magellanic Clouds, accretion of gas, outflowing material from the Galactic(More)
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218. Department of Astronomy, University of Wisconsin-Madison, 475 N. Charter Street, Madison, WI 53706. Princeton University Observatory, Princeton, NJ 08544. Current address: Department of Astronomy, University of Massachusetts, Amherst, MA 01003. Osservatorio Astrofisico di Arcetri,(More)
We present evidence that high-velocity cloud (HVC) Complex C is a low-metallicity gas cloud that is plunging toward the disk and beginning to interact with the ambient gas that surrounds the Milky Way. This evidence begins with a new high-resolution (7 km s−1 FWHM) echelle spectrum of 3C 351 obtained with the Space Telescope Imaging Spectrograph (STIS). 3C(More)
Models of the chemical evolution of the Milky Way suggest that the observed abundances of elements heavier than helium ('metals') require a continuous infall of gas with metallicity (metal abundance) about 0.1 times the solar value. An infall rate integrated over the entire disk of the Milky Way of approximately 1 solar mass per year can solve the 'G-dwarf(More)
The large H ii complex N11 in the Large Magellanic Cloud contains OB associations at several different stages in their life histories. We have obtained ROSAT PSPC and HRI X-ray observations, Curtis Schmidt CCD images, echelle spectra in Hα and [N II] lines, and IUE interstellar absorption line observations of this region. The central bubble of N11 has an(More)
Based on the detection of C iv absorption in five Large Magellanic Cloud (LMC) stars observed with the Goddard High-Resolution Spectrograph on the Hubble Space Telescope, we present the first unambiguous evidence that C exists in the LMC away from regions where it could have been locally produced. We can exclude that 13 this C is associated with hot(More)
The highand intermediate-velocity interstellar clouds (HVCs/IVCs) are tracers of energetic processes in and around the Milky Way. Clouds with near-solar metallicity about 1 kpc above the disk trace the circulation of material between disk and halo (the Galactic fountain). TheMagellanic Stream consists of gas tidally extracted from the SMC, tracing the dark(More)