FUSE Spectroscopy of the Transitional Magnetic Cataclysmic Variable
نویسندگان
چکیده
We present Far Ultraviolet Spectroscopic Explorer observations of the magnetic cataclysmic variable V405 Aurigae. Together with four other DQ Her type binaries, V405 Aur forms a small subclass of intermediate polars which are likely to evolve into low magnetic field strength polars, similar to AM Her. Our coadded FUSE spectrum exhibits broad O VI and C III emission-lines as well as a narrow O VI emission-line component which likely forms near the white dwarf surface. The O VI λ1032/λ1038 narrow emission line flux ratio is near 2.0 throughout the orbit, indicative of its formation in an optically thin gas. Radial velocity measurements of the narrow O VI emission-lines restrict any orbital modulation to a very low amplitude (Kwd =2.5 ± 0.5 km s ) indicating, along with other single peaked broad disk emission lines in the UV and optical, that the binary system is at low inclination. Subject headings: binaries: close – individual (V405 Aur) – novae: cataclysmic variables
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