Discovery of a new PG1159 (GW Vir) Pulsator

Abstract

We report the discovery of pulsations in the spectroscopic PG 1159 type pre-white dwarf SDSS J075415.12+085232.18. Analysis of the spectrum by Werner, Rauch and Kepler (2014) indicated Teff=120 000+/-10 000 K, log g=7.0+/-0.3, mass M=0.52+/-0.02 Msun, C/He=0.33 by number. We obtained time-series images with the SOAR 4.1 m telescope and 2.1 m Otto Struve telescope at McDonald Observatory and show the star is also a variable PG 1159 type star, with dominant period of 525 s.

5 pages, 3 figures

References in corpus (9)

• Pulsating White Dwarf Stars and Precision Asteroseismology
• Asteroseismic inferences on GW Vir variable stars in the frame of new PG 1159 evolutionary models
• New nonadiabatic pulsation computations on full PG1159 evolutionary models: the theoretical GW Vir instability strip revisited
• The pulsation modes of the pre-white dwarf PG 1159-035
• Asteroseismological measurements on PG 1159-035, the prototype of the GW Vir variable stars
• Asteroseismological constraints on the pulsating planetary nebula nucleus (PG1159-type) RX J2117.1+3412
• Asteroseismological constraints on the coolest GW Vir variable star (PG 1159-type)PG 0122+200
• The temporal changes of the pulsational periods of the pre-white dwarf PG 1159-035
• Puoko-nui: a flexible high-speed photometric system

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• Probing the structure of Kepler ZZ Ceti stars with full evolutionary models-based asteroseismology
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• Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS -- IV. Discovery of two new GW Vir stars: TIC0403800675 and TIC1989122424
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