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. There are no traces of a planetary nebula around this star.
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P. Pietrukowicz
Astronomical Observatory
K. Werner
Centre National de la Recherche Scientifique
Mateusz J. Mróz
University of Warsaw
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Pietrukowicz et al. (Mon,) studied this question.
synapsesocial.com/papers/68f0d5eb105731330a2b1f60 — DOI: https://doi.org/10.48550/arxiv.2502.17577