Abstract
We present a comprehensive study of dust grains in the p Ophiuchi dark cloud. By combining new polarimetric, optical photometric, and spectral classification data for 134 stars, cloud material is probed to an absorption depth of A V ≤ 5-7 mag. For stars with R determined from the color-difference method, a mean value of R = 3.99 ± 0.18 at a mean extinction of A V = 3.25 mag is found. R scales with the wavelength of maximum polarization at the rate R = 5.7λ max , consistent with results from other studies. Grain size, as deduced from λ max , increases with optical depth in a manner that is consistent with a simple model of turbulence-driven coagulative grain growth
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