An Extremely Hot Pulsating Pre-White Dwarf from OGLE

2025/02/24 by P. Pietrukowicz, Pietrukowicz, P., K. Werner +5
Physics and Astronomy · #Astronomy and Astrophysical Research #FOS: Physical sciences #Gamma-ray bursts and supernovae #Solar and Stellar Astrophysics (astro-ph.SR) #Stellar, planetary, and galactic studies

paper · pdf · doi:10.48550/arxiv.2502.17577

openalex publication_date 2025/02/24 · openalex created_date 2025/10/15 · openalex updated_date 2026/07/28

Abstract

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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