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We study the polarization efficiency (defined as the ratio of polarization toextinction) of stars in the background of the small, nearly spherical andisolated Bok globule CB4 to understand the grain alignment process. A decreasein polarization efficiency with an increase in visual extinction is noticed.This suggests that the observed polarization in lines of sight which intercepta Bok globule tends to show dominance of dust grains in the outer layers of theglobule. This finding is consistent with the results obtained for other cloudsin the past. We determined the distance to the cloud CB4 using near-infraredphotometry (2MASS JHKS colors) of moderately obscured stars located at theperiphery of the cloud. From the extinction-distance plot, the distance to thiscloud is estimated to be ($459 \pm 85$) pc.

Study of grain alignment efficiency and a distance estimate for small globule CB4