The DDO IVC Distance Project

Details The DDO IVC Distance Project The DDO IVC Distance Project

1998-11-18

arxiv.org/abs/astro-ph/9811291v1

Astronomy and Astrophysics

Astrophysics

11 pages, 5 figures, to appear in 'High-Velocity Clouds', ASP Conference Series

Scientific paper

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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