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PG1159-035: A New, Hot, Non-DA Pulsating Degenerate

  • J. T. McGraw (a1), S. G. Starrfield (a1), J. Liebert (a1) and R. Green (a2)

Extract

PG1159-035 was originally detected as a 14.5 mag. blue object in a survey for QSO candidates (Green 1977), An SIT spectrogram obtained at the Hale 5m telescope at 6Å resolution showed this star to have a very blue continuum with absorption features near λ4686 and λ4650 which were tentatively attributed to Hell and the CIII/CIV complex, respectively. Possible narrow emission components to these lines appear in Figure 1 which shows confirming spectra obtained with the IIDS (at 2.5Å resolution) on the Kitt Peak 2.1m telescope. The blue continuum and possible presence of Hell in emission suggested that this star was perhaps similar to the helium mass-transfer binary AM CVn (HZ 29). For this reason, we put PG1159-035 on our program of high-speed photometry, expecting the star to show “flickering” associated with mass transfer into an accretion disk and possible orbital modulation or eclipses in the period range 10-20 minutes—photometric characteristics similar to those observed in AM CVn.

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Copyright

Corresponding author

* Permanent address, Dept. of Physics, Arizona State University; present address, Theoretical Division, Los Alamos Scientific Laboratory

References

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Angel, J.R.P. and Landstreet, J.D. 1970, Ap.J. (Letters), 160, L147.
Green, R. 1977, Ph.D. Thesis, California Institute of Technology.
McGraw, J.T. 1977, Ph.D. Thesis, University of Texas at Austin.
McGraw, J.T. and Robinson, E.L. 1976, Ap.J., 205, L155.
McGraw, J.T. and Starrfield, S.G., Angel, J.R.P., and Carleton, N.P., 1979, “Proceedings of the Multiple Mirror Telescopes Dedication Symposium”, Smithsonian Special Report, in press.
Robinson, E.L., Nather, R.E., and McGraw, J.T. 1976, Ap.J., 210, 211.
Stover, R.J., Robinson, E.L., and Nather, R.E. 1977, PASP, 89, 912.
Stover, R.J., Hesser, J.E., Lasker, B.M., Nather, R.E., and Robinson, E.L., 1979, preprint.

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