Observations of variable stars with the R Coronae Borealis phenomenon and other unique objects

The results of photometry and polarimetry of the R Coronae Borealis type stars and other interesting objects are given. The observation of the former objects are obtained at the light maximum or at a brightness lower by 2‐3 mag. The polarization of R CrB stars at light maximum has interstellar origin. The absolute magnitude of V 854 Cen is estimated to M s v w = −3 m , and for Y Mus it is M v > −3 m .7. ρ Cas has a variable polarization and is probably a giant ( M v ≅ 0 m ) rather than a supergiant. Many early stars in its surroundings are photometrically and polarimetrically variable. The protoplanetary star BD −0°3679 has a polarization with the Rayleigh component.