Physics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.300..152j&link_type=abstract
Nature, vol. 300, Nov. 11, 1982, p. 152-155.
Physics
18
Magnetic Stars, Stellar Rotation, Ultraviolet Spectra, Variable Stars, White Dwarf Stars, X Ray Sources, Binary Stars, Continuous Spectra, Iue, Light Curve, Stellar Mass Accretion, Stellar Models, Stellar Spectra
Scientific paper
Observations of four short and four long wavelength low dispersion spectra obtained with the IUE satellite spectrometer are examined. Variations in ultraviolet and X-ray wavelengths around the orbital cycle are reported to rule out a hot spot/accretion disk model for TT Ari. It is proposed that TT Ari has a magnetized white dwarf primary rotating with the photometric period of 0.1329 days. It is noted that a disk atmosphere model may be the explanation of the whole observed spectral shape range of 5500-1265 A, but the correlation of the UV and X-ray variation renders such a model implausible. In addition, the axisymmetry of models involving an accretion disk with X-rays generated at the boundary layer would cause short wavelength UV and X-ray modulation to be difficult since absorption events are not seen and scattering is not plausible. Finally, it is noted that TT Ari can be described as an intermediate between the DQ Her and AM Her types.
Frank Jacki
Jameson Richard F.
King Andrew R.
Sherrington M. R.
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