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Understanding the effects of dust extinction is important to properlyinterpret observations. The optical total-to-selective extinction ratio, Rv =Av/E(B-V), is widely used to describe extinction variations in ultraviolet andoptical bands. Since the Rv=3.1 extinction curve adequately represents theaverage extinction law of diffuse regions in the Milky Way, it is commonly usedto correct observational measurements along sightlines toward diffuse regionsin the interstellar medium. However, the Rv value may vary even along differentdiffuse interstellar medium sightlines. In this paper, we investigate theoptical--mid-infrared (mid-IR) extinction law toward a very diffuse region at l= 165 in the Galactic plane, which was selected based on a CO emission map.Adopting red clump stars as extinction tracers, we determine theoptical-to-mid-IR extinction law for our diffuse region in the two APASS bands(B, V), the three XSTPS-GAC bands (g, r, i), the three 2MASS bands (J, H, Ks,and the two WISE bands (W1, W2). Specifically, 18 red clump stars were selectedfrom the APOGEE--RC catalog based on spectroscopic data in order to explore thediversity of the extinction law. We find that the optical extinction curvesexhibit appreciable diversity. The corresponding Rv ranges from 1.7 to 3.8,while the mean Rv value of 2.8 is consistent with the widely adopted averagevalue of 3.1 for Galactic diffuse clouds. There is no apparent correlationbetween Rv value and color excess E(B-V) in the range of interest, from 0.2 to0.6 mag, or with specific visual extinction per kiloparsec, AV/d.

astrophysical journal/the astrophysical journal

The Optical -- Mid-infrared Extinction Law of the l=165 Sightline in the  Galactic Plane: Diversity of Extinction Law in the Diffuse Interstellar  Medium