Other
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.206..261w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 206, Jan. 15, 1984, p. 261-271.
Other
24
Light Curve, Stellar Spectra, Stellar Spectrophotometry, Variable Stars, Fourier Analysis, High Speed, Stellar Models, Stellar Oscillations
Scientific paper
The presently reported and analyzed 104 hr of photometry of the Intermediate Polar V1223 Sgr at 5 and 10 s time resolution were obtained during 1981 and 1982. From the various periodic brightness modulations, an orbital period of 0.140239 day, a rotation period of the primary of 794.380 s, and an orbital sideband of 849.8 s are derived. The last is only intermittently present. The 794 and 850 s oscillations are in phase coherence at maximum of the orbital brightness modulation. The contrast with AO Psc (H 2252-035), where phase coherence occurs at orbital brightness minimum, leads to a model in which the 794 s modulation results from reprocessing of X-ray beam from the axisymmetric parts of the accretion disc. The high speed brightness variations of V1223 Sgr possess two unusual properties: an intrinsic 'scintillation', in which the system may increase or decrease its brightness by 10-20 percent on time-scales of about 100 s, and excess power in the frequency range of 0.04-0.08 Hz, when compared with other active cataclysmic variables. The Intermediate Polar AO Psc shows similar behavior.
Cropper Mark
Warner Brian
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