On the location of the oscillations in AE Aquarii

Abstract

view Abstract Citations (49) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the Location of the Oscillations in AE Aquarii Welsh, William F. ; Horne, Keith ; Gomer, Richard Abstract There is much recent interest on the nature of the oscillations in the cataclysmic variable AE Aquarii. Detected in the optical, UV, X-ray, and possibly gamma-ray bands, the origin of these 33-sec oscillations remains poorly understood; the oscillation time-delay curve is phase shifted by about 60 deg with respect to the emission-line radial velocity curve, although both should track the orbital motion of the white dwarf. We present simultaneous absorption and emission-line radial velocities, and from the absorption lines we derive an improved ephemeris. Our emission-line velocities are phase shifted by about 75 deg, and hence are unreliable tracers of the orbital motion of the white dwarf. However, the oscillation orbit is shifted by only 5 deg +/- 3 deg percent confirming that the oscillations arise from a region concentric with the white dwarf. Thus the arrival times of the oscillations yield a measure of the white dwarfs apparent orbital velocity, independent of emission-line radial velocity measurements. Publication: The Astrophysical Journal Pub Date: June 1993 DOI: 10.1086/186874 Bibcode: 1993ApJ...410L..39W Keywords: Cataclysmic Variables; Emission Spectra; Stellar Oscillations; Stellar Spectra; Ephemeris Time; Phase Shift; Radial Velocity; Stellar Models; White Dwarf Stars; X Ray Spectra; Astrophysics; STARS: NOVAE; CATACLYSMIC VARIABLES; STARS: INDIVIDUAL CONSTELLATION NAME: AE AQUARII; STARS: OSCILLATIONS full text sources ADS | data products SIMBAD (1)