Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003astl...29...31s&link_type=abstract
Astronomy Letters, vol. 29, p. 31-36 (2003)
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present the optical observations of the AM Herculis system EU UMa (=RE1149+28) carried out in February 1993 with a TV scanner and a photometer (NEPh) at the secondary focus of the 6-m Special Astrophysical Observatory telescope. Spectroscopy with a time resolution of 300 s and a spectral resolution of 2 A in the wavelength range 3950-4950 A is used to analyze the variability of emission-line profiles, equivalent widths, central intensities R_c, and radial velocities with orbital phase. We determined the orbital period of the system from line radial-velocity measurements, 90.0 +/- 0.2 min. The emission-line profiles are highly variable. The H_beta and He II 4686 lines exhibit P Cyg profiles at selected phases. The spectral-line parameters were found to vary significantly on time scales from 5 to 15 min. The possible causes of the detected spectroscopic variability are discussed.
Bonnet-Bidaud Jean-Marc
Mouchet Martine
Somov Nicolai
Somova T. A.
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