The DDO IVC Distance Project
Michael D. Gladders, Tracy E. Clarke, Christopher R. Burns, Allen Attard, Michael P. Casey, Devon Hamilton, Gabriela Mallen-Ornelas, Jennifer L. Karr, Sara M. Poirier, Marcin Sawicki, Felipe Barrientos, Wayne Barkhouse, Mark Brodwin, Jason Clark, Rosemary McNaughton, Marcelo Ruetalo-Pacheco, Stefan W. Mochnacki
Abstract
We present the first set of distance limits from the David Dunlap Observatory Intermediate Velocity Cloud (DDO IVC) distance project. Such distance measures are crucial to understanding the origins and dynamics of IVCs, as the distances set most of the basic physical parameters for the clouds. Currently there are very few IVCs with reliably known distances. This paper describes in some detail the basic techniques used to measure distances, with particular emphasis on the the analysis of interstellar absorption line data, which forms the basis of our distance determinations. As an example, we provide a detailed description of our distance determination for the Draco Cloud. Preliminary distance limits for a total of eleven clouds are provided.
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