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- W4383313525 abstract "The nature of dust in the diffuse interstellar medium can be best investigated by means of reddening curves where only a single interstellar cloud lies between the observer and the background source. Published reddening curves often suffer from various systematic uncertainties. We merged a sample of 820 reddening curves of stars for which both FORS2 polarization spectra and UVES highresolution spectra are available. The resulting 111 sightlines towards OB-type stars have 175 reddening curves. For these stars, we derived their spectral-type from the UVES high-resolution spectroscopy. To obtain high-quality reddening curves, we excluded stars with composite spectra in the IUE/FUSE data due to multiple stellar systems. Likewise, we omitted stars that have uncertain spectral-type designations or stars with photometric variability. We neglected stars that show inconsistent parallaxes when comparing data releases two and three from Gaia . Finally, we identified stars that show differences in the space- and ground-based-derived reddening curves between 0.28 µm and the U band or in R V . In total, we find 53 stars with one or more reddening curves passing the rejection criteria. This provides the highest-quality Milky Way reddening curve sample available today. Averaging the curves from our high-quality sample, we find R V = 3.1 ± 0.4, confirming previous estimates. A future paper in this series will use the current sample of precise reddening curves and combine them with polarization data to study the properties of dark dust." @default.
- W4383313525 created "2023-07-07" @default.
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- W4383313525 date "2023-08-01" @default.
- W4383313525 modified "2023-10-01" @default.
- W4383313525 title "Dark Dust. III. The high-quality single-cloud reddening curve sample. Scrutinizing extinction curves in the Milky Way" @default.
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- W4383313525 doi "https://doi.org/10.1051/0004-6361/202244594" @default.
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