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The Time Dependence of the Phases of the Harmonics Relative to the 1490 sec Fundamental in PG1346+082

  • J. L. Provencal (a1), J. C. Clemens (a1), G. Henry (a1), B. P. Hine (a1), R. E. Nather (a1), D. E. Winget (a1), M. A. Wood (a1), S. O. Kepler (a2), G. Vauclair (a3), M. Chevreton (a3), D. O’Donoghue (a4), B. Warner (a4), A. D. Grauer (a5) and Lilia Ferrario (a6)...

Extract

White dwarf stars provide important boundary conditions for the understanding of stellar evolution. An adequate understanding of even these simple stars is impossible without detailed knowledge of their interiors. PG1346+082, an interacting binary white dwarf system, provides a unique opportunity to view the interior of one degenerate as it is brought to light in the accretion disk of the second star as the primary strips material from its less massive companion (see Wood et at. 1987).

PG1346+082 is a photometric variable with a four magnitude variation over a four to five day quasi-period. A fast Fourier transform (FFT) of the light curve shows a complex, time-dependent structure of harmonics. PG1346+082 exhibits flickering – the signature of mass transfer. The optical spectra of the system contain weak emission features during minimum and broad absorption at all other times. This could be attributed to pressure broadening in the atmosphere of a compact object, or to a combination of pressure broadening and doppler broadening in a disk surrounding the compact accretor. No hydrogen lines are observed and the spectra are dominated by neutral helium. The spectra also display variable asymmetric line profiles.

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Copyright

References

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Lin, D. N., and Papaloizou, J. 1986, Ap. J. 307 395.
O’Donoghue, D., and Kilkenny, D., High Speed Spectroscopy and Photometry of the Interaction Binary White Dwarf V803 Cen (AE-1), preprint, 1988
Wood, M.A., Winget, D.E., Nather, R.E., Hessman, F.V., Liebert, J., Kurtz, D.W., Wesemael, F., Wegner, G., 1987, Ap. J., 313, 757.

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