backAn Extremely Hot Pulsating Pre-White Dwarf from OGLE
We show that the blue 18.3-minute variable object discovered in the Galactic disk by the OGLE-III survey and named OGLE-GD-WD-0001 is a pulsating pre-white dwarf of PG 1159 spectral type. With an effective temperature of about 160,000 K it is among the hottest known pulsators being located close to the blue edge of the GW Virginis instability strip. The long-term OGLE observations indicate that the object has a positive period change rate of about 5 × 10-10 s s−1 and thus already contracts.
OGLE-III I-band time-series data for object OGLE-GD-WD-0001 and results of the frequency analysis: distribution of the observations in time (top panel), cadence of the observations shown as a histogram of time differences between two subsequent exposures (second panel from the top), phase-folded original and pre-whitened light curves together with the power spectra (lower panels). The frequency is given in cycles per day.
Normalized spectrum of OGLE-GD-WD-0001 together with the best fit.
The underlying OGLE-III photometry data are available to the astronomical community from the OGLE Internet Archive.
PLEASE cite the following paper when using the data or referring to these OGLE results:
Pietrukowicz et al., 2025, The Astronomical Journal, 169, 339
Any comments about the data and the form of their presentation are welcome as they can improve the future releases of OGLE analysis. Send your messages to this address.
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