Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS - Discovery of two new GW Vir stars: TIC333432673 and TIC095332541
Creators
- 1. Universidad de Valparaiso and ESO
Description
The TESS mission is revolutionizing the blossoming area of asteroseismology, particularly of pulsating white dwarfs and pre-white dwarfs, thus continuing the impulse of its predecessor, the Kepler mission.
In this work, we present the observations from the extended TESS mission in both 120 s short-cadence and 20 s ultra-short-cadence mode of two pre-white dwarf stars showing hydrogen deficiency.
We apply the tools of asteroseismology with the aim of deriving their structural
parameters and seismological distances.
We carried out a spectroscopic analysis and a spectral fitting of TIC333432673 and TIC095332541. We also processed and analyzed the high-precision TESS photometric light curves of the two target stars, and derived
their oscillation frequencies. We performed an asteroseismological analysis of
these stars on the basis of PG1159 evolutionary models that take into
account the complete evolution of the progenitor stars. We searched for
patterns of uniform period spacings in order to constrain the stellar
mass of the stars, and employed the individual observed periods to search for a
representative seismological model.
Notes
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Additional details
References
- L. G. Althaus, A. M. Serenelli et al. (2005). The formation and evolution of hydrogen-deficient post-AGB white dwarfs: The emerging chemical profile and the expectations for the PG 1159-DB-DQ evolutionary connection. A&A, 435:631–648, May 2005
- Alejandro H. Córsico, Leandro G. Althaus, Marcelo M. Miller Bertolami, and S. O. Kepler. Pulsating white dwarfs: new insights. The Astronomy and Astrophysics Review, 27(1), Sep 2019
- M. Tassoul. Asymptotic approximations for stellar nonradial pulsations. ApJS, 43:469–490, August 1980
- W. Unno, Y. Osaki, H. Ando, H. Saio, and H. Shibahashi. Nonradial oscillations of stars. 1989
- K. Werner, T. Rauch, and S. O. Kepler. New hydrogen-deficient (pre-) white dwarfs in the Sloan Digital Sky Survey Data Release 10. A&A, 564:A53, April 2014