Total to Selective Extinction Ratios and Visual Extinctions from Ultraviolet Data

Details Total to Selective Extinction Ratios and Visual Extinctions from Ultraviolet Data Total to Selective Extinction Ratios and Visual Extinctions from Ultraviolet Data

2004-09-21

arxiv.org/abs/astro-ph/0409509v1

Astronomy and Astrophysics

Astrophysics

20 pages, 7 figures, submitted to Acta Astronomica

Scientific paper

We present determinations of the total to selective extinction ratio R_V and visual extinction A_V values for Milky Way stars using ultraviolet color excesses. We extend the analysis of Gnacinski 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 R_V and A_V values and their errors is available in the electronic form on the World Wide Web.

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