The extinction curve in the visible and the value of Rv

Details The extinction curve in the visible and the value of Rv The extinction curve in the visible and the value of Rv

2011-09-10

arxiv.org/abs/1109.2199v3

Astronomische Nachrichten, 2012, 333, p.160-5

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 figures. Published in Astronomische Nachrichten. Label of Fig. 1 is corrected in the present version. Paper previously rejec

Scientific paper

10.1002/asna.201111644

This article discusses the interstellar extinction curve in the visible and the value of Rv. It is concluded that the visible extinction curve is likely to be linear in the visible, and that indirect estimates of Rv from tentative determinations of Av, infrared, or UV observations are questionable. There is currently no evidence of any variation of Rv with direction. If Rv is close to 3, as it has been inferred from mid-infrared data, starlight in the visible is extinguished by a factor F/F_0=(2.5exp{-2micron/lambda})^{E(B-V)} in the visible. But if the visible wavelength range alone is considered, 4 appears as its most natural and probable value, and F/F_0= exp{-2E(B-V)/lambda}.

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