Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..250h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 15, 1990, p. 250-258. Research supported by t
Astronomy and Astrophysics
Astronomy
51
Absorption Spectra, Cataclysmic Variables, Emission Spectra, Light Curve, S Waves, Balmer Series, Doppler Effect, Helium, Stellar Orbits
Scientific paper
Analysis of 1000, 1-min spectra of FO Aqr reveals a peculiar absorption S-wave feature, varying with the orbital cycle, in the He I 4471 A and Balmer lines. The absorption S-wave is blueshifted by 200 km/s from the line center. The He II 4686 A line shows a more usual emission S-wave which is not blueshifted. That the absorption feature may result from material thrown out of the plane of the binary, possibly connected with the impact of the mass-transfer stream with the disk. Parallels are drawn between this observation and the recent discovery of anomalous absorption in the globular cluster X-ray source, AC211. The emission lines show a further radial-velocity variation with the spin cycle, phased with maximum blueshift at photometric maximum. This result supports the model for optical modulations in intermediate polars in which the variations are caused by the varying visibility of the accretion curtain as it sweeps round with the spin cycle. These data also indicate that the spin-modulated emission arises predominantly at one magnetic pole of the white dwarf. In addition, variations of the He II 4686 A line with three orbital side-bands of the spin period are detected. Thus, the data display the full range of periods predicted by Warner.
Cropper Mark
Hellier Coel
Mason Keith O.
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