Echelle-mepsicron time-resolved spectroscopy of the dwarf nova SS Cygni |
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Authors: | J Echevarria F Diego M Tapia R Costero |
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Institution: | (1) Instituto de Astronomía, Universidad Nacional Autónoma de México, Ensenada, México;(2) Department of Physics and Astronomy, University College London, London, U.K. |
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Abstract: | High dispersion time-resolved spectrograms of the dwarf nova SS Cygni, obtained with the Echelle-Mepsicron system, show double peaked emission lines with a complex profile. The intensity of the H line appears to be modulated by the orbital period. Radial velocity measurements of the wings of H and of the absorption line system of the late-type star yield semiamplitude values of Kem=101±6 km s–1 and Kab=151±7 km s–1, respectively. Radial velocity measurements of the blue and red peaks and of the central absorption of H reveal a synchronous movement with the broad wings, although there is some evidence of a narrow component probably associated with a hot spot in the disk or a chromospheric emission line from the secondary star. The H modulation, the double profile and recently discovered UBV light variations support an inclination angle i 50°. The masses of the primary are Mp=0.60 M and Ms=0.40 M , respectively. A detailed analysis of the absorption lines reveals a spectral type of K2V.Paper presented at the IAU Colloquium No. 93 Cataclysmic Variables. Recent Multi-Frequency Observations and Theoretical Developments , held at Dr. Remeis-Sternwarte Bamberg, F.R.G., 16–19 June, 1986. |
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