Pulsation in the white dwarf HE 1017−1352: confirmation of the class of hot DAV stars

ABSTRACT We report the detection of periodic variations on the $T_\mathrm{eff}\simeq 32\, 000$ K DA white dwarf star HE 1017−1352. We obtained time series photometry using the 4.1-m Southern Astrophysical Research telescope on three separate nights for a total of 16.8 h. From the frequency analysis,...

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Published in:Monthly notices of the Royal Astronomical Society. Letters 2020-09, Vol.497 (1), p.L24-L29
Main Authors: Romero, Alejandra D, Antunes Amaral, L, Kepler, S O, Fraga, L, Kurtz, D, Shibahashi, H
Format: Article
Language:English
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Summary:ABSTRACT We report the detection of periodic variations on the $T_\mathrm{eff}\simeq 32\, 000$ K DA white dwarf star HE 1017−1352. We obtained time series photometry using the 4.1-m Southern Astrophysical Research telescope on three separate nights for a total of 16.8 h. From the frequency analysis, we found four periods of 605, 556, 508, and 869 s with significant amplitudes above the 1/1000 false alarm probability detection limit. The detected modes are compatible with low harmonic degree g-mode non-radial pulsations with radial order higher than ∼9. This detection confirms the pulsation nature of HE 1017−1352 and thus the existence of the new pulsating class of hot DA white dwarf stars. In addition, we detect a long period of 1.52 h, compatible with a rotation period of DA white dwarf stars.
ISSN:1745-3925
1745-3933
DOI:10.1093/mnrasl/slaa106