Discovery of a new PG1159 (GW Vir) Pulsator
S. O. Kepler, Luciano Fraga, Don Earl Winget, Keaton Bell, Alejandro, H. Corsico, and Klaus Werner
TL;DR
This paper reports the discovery of pulsations in a PG 1159 pre-white dwarf star, expanding the known class of pulsating PG 1159 stars and providing new data on stellar evolution.
Contribution
The paper presents the first detection of pulsations in the PG 1159 star SDSS J075415.12+085232.18, adding a new member to the class of GW Vir pulsators.
Findings
Star exhibits pulsations with a dominant period of 525 seconds.
Spectroscopic parameters confirm its classification as a PG 1159 star.
Discovery broadens understanding of pulsation properties in pre-white dwarf stars.
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.
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