Forbidden high excitation lines and TiO bands in the symbiotic system QW SGE = MH-alpha 80-5

Details Forbidden high excitation lines and TiO bands in the symbiotic system QW SGE = MH-alpha 80-5 Forbidden high excitation lines and TiO bands in the symbiotic system QW SGE = MH-alpha 80-5

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.197..251c&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 197, no. 2, p. 251-256.

Astronomy and Astrophysics

Astrophysics

Forbidden Bands, Line Spectra, Stellar Spectra, Symbiotic Stars, Titanium Oxides, H Alpha Line, Infrared Spectra, Ionization Potentials

Scientific paper

The suspected symbiotic nature of MH-alpha 80-5 = AS 360 was confirmed for the first time by spectra taken in 1967 at Asiago Observatory (Marini, 1969) showing the O III and Ne III forbidden lines, together with strong He II 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 forbidden Fe VII and O VI, in 1990 were noted by Munari and Buson (1991). The evolution implies density variability in the thick nebula surrounding this new variable system.

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