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We determine the extinction law through Cep OB3b, a young cluster of 3000stars undergoing gas dispersal. The extinction is measured toward 76 backgroundK giants identified with MMT/Hectospec spectra. Color excess ratios weredetermined toward each of the giants using $V$ and $R$ photometry from theliterature, $g$,$r$,$i$ and $z$ photometry from SDSS and $J$, $H$, and $K_{s}$photometry from 2MASS. These color excess ratios were the used to construct theextinction law through the dusty material associated with Cep OB3b. Theextinction law through Cep OB3b is intermediate between the $R_{V} = 3.1$ and$R_{V} = 5$ laws commonly used for the diffuse atomic ISM and dense molecularclouds, respectively. The dependence of the extinction law on line-of-sight$A_{V}$ is investigated and we find the extinction law becomes shallower forregions with $A_{V} > 2.5$ magnitudes. We speculate that the intermediate dustlaw results from dust processing during the dispersal of the molecular cloud bythe cluster.

An Anomalous Extinction Law in the Cep OB3b Young Cluster: Evidence for dust processing during gas dispersal