Symbiotic Star AS:201 - a Planetary Nebula
Abstract
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.
- Publication:
-
Astrophysics and Space Science
- Pub Date:
- March 1987
- DOI:
- 10.1007/BF00668174
- Bibcode:
- 1987Ap&SS.131..781K
- Keywords:
-
- Emission Spectra;
- Line Spectra;
- Planetary Nebulae;
- Stellar Evolution;
- Symbiotic Stars;
- Visible Spectrum;
- Absorption Spectra;
- Hot Stars;
- Interstellar Extinction;
- Mass Distribution;
- Stellar Mass Ejection;
- Stellar Spectrophotometry;
- Astrophysics;
- Absorption Spectrum;
- Mass Loss;
- Emission Line;
- Optical Spectrum;
- Central Star