Far-UV FUSE spectra of peculiar magnetic cataclysmic variables.pdfVIP

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Far-UV FUSE spectra of peculiar magnetic cataclysmic variables.pdf

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Far-UV FUSE spectra of peculiar magnetic cataclysmic variables

a r X i v : a s t r o - p h / 0 3 0 2 3 1 9 v 1 1 7 F e b 2 0 0 3 **TITLE** ASP Conference Series, Vol. **VOLUME***, **YEAR OF PUBLICATION** **NAMES OF EDITORS** Far-UV FUSE Spectra of Peculiar Magnetic Cataclysmic Variables Martine Mouchet1, Jean-Marc Bonnet-Bidaud2, Evelyne Roueff1, Meil Abada-Simon1, Klaus Beuermann3, Domitilla de Martino4, Jean-Michel Desert5, Roger Ferlet5, Robert Fried6, Boris Ga?nsicke7, Steve Howell8, Koji Mukai9, Delphine Porquet10, Paula Szkody11 1Observatoire de Paris, 5 Place J. Janssen, 92190 Meudon, F 2DAPNIA/Service d’Astrophysique,CEA-Saclay, Gif-sur-Yvette, F 3Universta?ts-Sternwarte, Go?ttingen, D 4Osservatorio Astronomico Capodimonte, Naples, I 5Institut d’Astrophysique de Paris, Paris, F 6Braeside Observatory, Flagstaff, AZ, USA 7Department of Physics and Astronomy, University of Southampton, UK 8Astrophysics Group, Planetary Science Institute, Tucson, AZ, USA 9NASA Goddard Space Flight Center, Greenbelt, MD, USA 10Max-Planck-Institut fr Extraterrestrische Physik, Garching, D 11Department of Astronomy, University of Washington, Seattle, WA, USA Abstract. We present far-UV spectra of the three magnetic cataclysmic variables (MCVs) BY Cam, V1309 Ori and AE Aqr obtained with the FUSE satellite. These MCVs have revealed strongly unusual NV and CIV UV resonance lines. The FUSE spectra exhibit broad OVI lines as well as a strong NIII line at 991A?, while the CIII 1175A? line is nearly absent, supporting non-solar CNO abundances of the accreting matter in these sources. The spectrum of BY Cam shows molecular H2 lines which might be of circumstellar nature. The flaring activity of AE Aqr is also observed in the far-UV range. The radial velocities of the broad OVI components in AE Aqr are orbitally modulated and would indicate an emission region close to the magnetosphere. 1. Introduction Among magnetic cataclysmic variables (MCV), three Polars (BY Cam, V1309 Ori, MN Hya) and one intermediate polar (AE Aqr) have been discovered to ex