Journal
ASTROPHYSICAL JOURNAL
Volume 737, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/737/2/103
Keywords
dust, extinction; Galaxy: stellar content; ISM: clouds
Categories
Funding
- NASA [NNX10AD69G]
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- NASA [NNX10AD69G, 135583] Funding Source: Federal RePORTER
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We present measurements of dust reddening using the colors of stars with spectra in the Sloan Digital Sky Survey. We measure reddening as the difference between the measured and predicted colors of a star, as derived from stellar parameters from the Sloan Extension for Galactic Understanding and Exploration Stellar Parameter Pipeline. We achieve uncertainties of 56, 34, 25, and 29 mmag in the colors u - g, g - r, r - i, and i - z, per star, though the uncertainty varies depending on the stellar type and the magnitude of the star. The spectrum-based reddening measurements confirm our earlier blue tip reddening measurements, finding reddening coefficients different by -3%, 1%, 1%, and 2% in u - g, g - r, r - i, and i - z from those found by the blue tip method, after removing a 4% normalization difference. These results prefer an R-V = 3.1 Fitzpatrick reddening law to O'Donnell or Cardelli et al. reddening laws. We provide a table of conversion coefficients from the Schlegel et al. (SFD) maps of E(B - V) to extinction in 88 bandpasses for four values of R-V, using this reddening law and the 14% recalibration of SFD first reported by Schlafly et al. and confirmed in this work.
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