Spectroscopic and photometric studies of the magnetic cataclysmic variable EU UMa (=RE1149+28) |
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| Authors: | T A Somova N N Somov J M Bonnet-Bidaud M Mouchet |
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| Institution: | (1) Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Stavropolskii krai, 369167, Russia;(2) Service d'Astrophysique, Centre d'Etudes Nucleaires de Saclay CEA/DSM/DAPNIA/SAP, 91191 Gif-sur-Yvette Cedex, France;(3) LUTH Observatoire de Paris-Medon, F-92190 Medon, France;(4) Universitè Denise Diderot, F-75005 Place Jussieu, Paris Cedex, France |
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| Abstract: | 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 Å in the wavelength range ≈3950–4950 Å is used to analyze the variability of emission-line profiles, equivalent widths, central intensities Rc, 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 Hβ and He II 4686 Å 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. |
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| Keywords: | stars-variable and peculiar polars accretion |
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