Total to Selective Extinction Ratios and Visual Extinctions from Ultraviolet Data

We present determinations of the total to selective extinction ratio RV and visual extinction AV values for Milky Way stars using ultraviolet color excesses. We extend the analysis of Gnaciński and Sikorski (1999) by using non-equal weights derived from observational errors. We present a detailed discussion of various statistical errors. In addition, we estimate the level of systematic errors by considering different normalization of the extinction curve adopted by Wegner (2002). Our catalog of 782 RV and AV values and their errors is available in the electronic form on the World Wide Web.