Symbiotic star AS 201: A planetary nebula

Optical spectrum of AS 201 is presented: this object shows emission lines of moderate excitation (exc. class 5) and absorption spectrum of a G2III star. For the interstellar extinction and distance the values c=0.45 and d=1.5 kpc were estimated. The hot components of AS 201, Cn 1-1 and M 1-2 are located on the Harman-Seaton sequence in the region of evolved central stars of PN. It is suggested that the hot components of some SS are evolved nuclei of PN; high el. density of their nebulae may be explained due to mass loss from the respective cool stars of the binaries.Paper presented at the IAU Colloquium No. 93 on Cataclysmic Variables. Recent Multi-Frequency Observations and Theoretical Developments, held at Dr. Remeis-Sternwarte Bamberg, F.R.G., 16–19 June, 1986.