Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985azh....62...81v&link_type=abstract
(Astronomicheskii Zhurnal, vol. 62, Jan.-Feb. 1985, p. 81-86) Soviet Astronomy (ISSN 0038-5301), vol. 29, Jan.-Feb. 1985, p. 48-
Astronomy and Astrophysics
Astronomy
Binary Stars, Diurnal Variations, Dwarf Novae, Radial Velocity, Spectrum Analysis, Stellar Spectrophotometry, Balmer Series, Electron Density (Concentration), Emission Spectra, Spectral Line Width, Stellar Mass Accretion, Stellar Orbits
Scientific paper
The dwarf nova star SU UMa has been observed using the prime focus of the 6-meter telescope of the Special Astrophysical Observatory at Nizhni Arkhyz, USSR. Spectrograms were obtained at several epochs on the declining branch when the star was in quiescence. The resolution of the spectra was approximately 3.5 A. Analyses of the equivalent widths and Balmer-jump amplitudes showed random nightly fluctuations, which suggest either variable radial velocities with a period of 3 hours and 5 minutes + or - 10 minutes, or orbital motion with a period of about two hours. The Balmer decrement was partially inverted at times of outburst, despite gentle periods during minimum light. Electron density in the emission zone was greater than 10 to the 14th per cu cm. It is suggested that SU UMa is experiencing severe instabilities due to a highly unstable accretion regime. A list of the mean equivalent line widths in SU UMa is provided.
Nazarenko I. I.
Vojkhanskaya N. F.
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