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We investigate the efficiency of interstellar polarization$p_\lambda/A_\lambda$ where $p_\lambda$ is the fractional linear polarizationand $A_\lambda$ is extinction, in 16 lines of sight as a function of wavelength$\lambda$. We have used the data obtained with the low-dispersionspectropolarimeter HBS as well as those in literature. It is found that thepolarization efficiency $p_\lambda/A_\lambda$ is proportional to$\exp(-\beta/\lambda)$ in wavelength $\lambda \approx 0.4-0.8 \micron$, where$\beta$ is a parameter which varies from 0.5 to 1.2 $\micron$. We find that$\beta$ is negatively correlated with the dust temperature deduced frominfrared data by Schlegel et al., suggesting that the polarization efficiencyis higher in short wavelength for higher temperature. According to thealignment theory by radiative torques (RATs), if the radiation is stronger andbluer, RATs will make small grains align better, and the polarizationefficiency will increase in short wavelength. Our finding of the correlationbetween $\beta$ and the temperature is consistent with what is expected withthe alignment mechanism by RATs.

Correlation between Interstellar Polarization and Dust Temperature: Alignment of Grains by Radiative Torques is Ubiquitous?