15 Rood oog

Vries, H. de; Zaal, M. J. W.; Blankenstein, A. H.

doi:10.1007/978-90-313-8364-1_16

Cited by 1 publication

(1 citation statement)

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“…Moreover, for a true sightline, there exists apparent deviation from the CCM89 analytical extinction curve calculated for a given value of R V (Mathis 1990). The extinction toward HD 210121, located behind the core of a molecular cloud (Deśert et al 1988;de Vries & van Dishoeck 1988), can be best fitted by the CCM89 R V = 2.1 curve, but it shows a significantly lower bump at 2175Å and a much steeper rise in the far-UV compared with the average behavior for the same value of R V (Larson et al 2000). The present work aims at revealing the diversity of the extinction law in diffuse regions by carefully examining a very diffuse sightline covering an area of four square degrees.…”

Section: Introductionmentioning

confidence: 95%

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

Wang

Jiang

Zhao

et al. 2017

ApJ

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Understanding the effects of dust extinction is important to properly interpret observations. The optical total-to-selective extinction ratio,, is widely used to describe extinction variations in ultraviolet and optical bands. Since the R V = 3.1 extinction curve adequately represents the average extinction law of diffuse regions in the Milky Way, it is commonly used to correct observational measurements along sightlines toward diffuse regions in the interstellar medium. However, the R V value may vary even along different diffuse interstellar medium sightlines. In this paper, we investigate the optical-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 the optical-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, K s ), and the two WISE bands (W 1, W 2). Specifically, 18 red clump stars were selected from the APOGEE-RC catalog based on spectroscopic data in order to explore the diversity of the extinction law. We find that the optical extinction curves exhibit appreciable diversity. The corresponding R V ranges from 1.7 to 3.8, while the mean R V value of 2.8 is consistent with the widely adopted average value of 3.1 for Galactic diffuse clouds. There is no apparent correlation between R V value and color excess E(B − V ) in the range of interest, from 0.2 to 0.6 mag, or with specific visual extinction per kiloparsec, A V /d.

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