Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.131..501m&link_type=abstract
(IAU, Colloquium on Cataclysmic Variables. Recent Multi-Frequency Observations and Theoretical Developments, 93rd, Bamberg, West
Astronomy and Astrophysics
Astrophysics
3
Absorption Spectra, Dwarf Novae, Stellar Spectrophotometry, Balmer Series, H Alpha Line, Periodic Variations, Radial Velocity, Spectral Line Width
Scientific paper
Two outbursts and a minimum phase of the dwarf nova CN Orionis have been observed spectroscopically. The outburst spectra show periodic variations of the absorption lines which are interpreted with the formation of an elliptic disc during outburst stage. During decline from outburst a narrow emission line appears in the core of the broad Hα absorption line. The Balmer decrement in the outburst phase is much steeper than in the minimum phase. This implies that during the outburst the emission line region is located more outward in the disk. The semi amplitude of the radial velocity curve was determined to K1 = 152±10 km/s. Using the photometric orbital period and an assumption about the inclination angle the approximate system parameters could be derived.
Barwig Heinz
Haefner Reinhold
Mantel Karl-Heinz
Schoembs R.
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