David F. Malin

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We have measured nonzero closure phases for about 29% of our sample of 56 nearby asymptotic giant branch (AGB) stars, using the three-telescope InfraredOptical Telescope Array (IOTA) interferometer at near-infrared wavelengths (H band) and with angular resolutions in the range 5Y10 mas. These nonzero closure phases can only be generated by asymmetric(More)
Nicotine is the principal addictive component of tobacco. Vaccination of rats against nicotine elicits the production of nicotine-specific antibodies which can bind and sequester nicotine in serum and extracellular fluid, reduce nicotine distribution to brain, and reduce many of nicotine's physiologic and behavioral effects. Vaccination reduces the(More)
We report the first spatially-resolved observations of the spectroscopic binaries λ Vir and WR 140, which includes the debut of aperture-synthesis imaging with the upgraded three-telescope IOTA interferometer. Using IONIC-3, a new integrated optics beam combiner capable of precise closure phase measurement, short observations were sufficient to extract the(More)
The UK Schmidt Telescope (UKST) of the Anglo-Australian Observatory completed a narrow-band Hα plus [NII] 6548, 6584Å survey of the Southern Galactic Plane and Magellanic Clouds in late 2003. The survey, which was the last UKST wide-field photographic survey, and the only one undertaken in a narrow band, is now an on-line digital data product of the(More)
Deep images of the Centaurus and Coma clusters reveal two spectacular arcs of diffuse light that stretch for over 100 kpc, yet are just a few kpc wide. At a surface brightness of mb ∼ 27 − 28th arcsec−2, the Centaurus arc is the most striking example known of structure in the diffuse light component of a rich galaxy cluster. We use numerical simulations to(More)
Deep images of the Centaurus and Coma clusters reveal two spectacular arcs of diiuse light that stretch for over 100 kpc, yet are just a few kpc wide. At a surface brightness of m b 27?28th arcsec ?2 , the Centaurus arc is the most striking example known of structure in the diiuse light component of a rich galaxy cluster. We use numerical simulations to(More)
Factors governing photographic image quality in the scanning electron microscope are discussed with particular reference to the commonly used EXA camera on the Cambridge Stereoscan IIa. It is shown that the small image on the medium speed film suffers considerable loss of information due to the turbid nature of the photographic emulsion. Inexpensive(More)