Forbidden High Excitation Lines and Tio Bands in the Symbiotic System Qw-Sagittae = MH-ALPHA:80-5
Abstract
The suspected symbiotic nature of MHα80-5=AS 360 was confirmed for the first time by spectra taken in 1967 at Asiago Observatory (Marini, 1969) showing the [OIII] and [NeIII] forbidden lines, together with strong HeII lines and TiO bands. According to Allen (1984) nebular lines were absent in 1978, while we recorded them again in 1985. Further excitation strengthening up to [FeVII] andOVI, in 1990 were noted by Munari and Buson (1991). The evolution implies density variability in the thick nebula surrounding this new variable system.
- Publication:
-
Astrophysics and Space Science
- Pub Date:
- November 1992
- DOI:
- 10.1007/BF00645738
- Bibcode:
- 1992Ap&SS.197..251C
- Keywords:
-
- Forbidden Bands;
- Line Spectra;
- Stellar Spectra;
- Symbiotic Stars;
- Titanium Oxides;
- H Alpha Line;
- Infrared Spectra;
- Ionization Potentials;
- Astrophysics;
- Variable System;
- High Excitation;
- Excitation Line;
- Symbiotic System;
- Density Variability