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X-Ray Discovery of a Hot PG 1159 Star, RX J0122.9-7521

A. P. Cowley, P. C. Schmidtke, J. B. Hutchings and D. Crampton
Publications of the Astronomical Society of the Pacific
Vol. 107, No. 716 (1995 October), pp. 927-930
Stable URL: http://www.jstor.org/stable/40680630
Page Count: 4
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X-Ray Discovery of a Hot PG 1159 Star, RX J0122.9-7521
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Abstract

The supersoft X-ray source RX J0122.9-7521 has been optically identified with an extremely hot PG 1159 star. Its spectrum shows high-excitation emission lines from which we estimate Teff ~ 140,000 K and log g~7. Limited photometry taken during six nights shows no conclusive variability, but we cannot rule out short-period, low-amplitude pulsations (P< 5 min) as are found in some PG 1159 stars. There is some evidence for variations in the emission-line strengths, but higher-quality spectra are needed to confirm this.

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