QQ Vul Revisited
With simultaneous blue (λλ4200–5000Å) and far-red (λλ7950–8380 Å) phase-resolved, high resolution spectrophotometry, we re-examine the magnetic CV QQ Vul. A thorough radial velocity and flux analysis of all the observable features is carried out. We derive a complete set of system parameters and classify the donor star to be a spectral type M4.5 V. In addition to the Balmer, He i and He ii emission lines in the blue range, arising from the accretion regions, we detect various emission features which solely follow the movement of the secondary star. The lines, which we interpret as reprocessed light from the illuminated hemisphere of the donor star, are Mg ii at λ4481Å, He ii at λ8236Å and C i at λ 8335 Å. Intensity maps based on the line flux and radial velocity variations of the Na i absorption near A8190Á and Mg ii emission feature were also made. These show that the line distribution on the surface of the donor is consistent with being symmetric. As a result of our analysis the position of the real zero phase was found to be at ø = 0.42 of the linear polarisation ephemeris.
KeywordsRadial Velocity Emission Feature Spectral Type Line Flux Line Distribution
- Martin J.S., Friend, M.T., Smith, R.C.,1989, MNRAS, 240, 519Google Scholar