Interstellar polarisation towards a region around B5

Interstellar polarization was known to give information on the direction of galactic magnetic fields. Nowadays, the Gaia parallaxes and various photometric surveys allow the wavelength dependence of this polarization to provide even more information about the magnetic fields and dust grains. We consider the region of the interstellar medium towards the Bok globule Bernard 5 (B5, $l \approx 161^{\circ}$, $b \approx 17^{\circ}$). We performed a spectroscopic study of stars in this region at 0.7-m telescope of the Abastumani observatory. We carried out $UBVRI$ polarimetric observations of some of our stars at 1.25-m and 2.6-m CrAO telescopes and determined the parameters of the dependence of polarization on wavelength. Using stellar photometry and parallaxes available from recent sky surveys, we have estimated the visual extinction towards the observed stars. By analyzing the relationship between the parameters of the interstellar polarization and extinction for stars located at different distances and at different angular distances from the B5 globule, the structure and properties of the interstellar medium in the region under consideration are discussed.