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dc.contributor.author
Uzundag, Murat
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dc.contributor.author
Corsico, Alejandro Hugo
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dc.contributor.author
Kepler, S. O.
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dc.contributor.author
Althaus, Leandro Gabriel
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dc.contributor.author
Werner, Klaus
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dc.contributor.author
Reindl, N.
dc.contributor.author
Bell, K.J.
dc.contributor.author
Higgins, M.
dc.contributor.author
Da Rosa, G.O.
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Vučković, M.
dc.contributor.author
Istrate, A.
dc.date.available
2023-09-20T17:16:36Z
dc.date.issued
2021-11
dc.identifier.citation
Uzundag, Murat; Corsico, Alejandro Hugo; Kepler, S. O.; Althaus, Leandro Gabriel; Werner, Klaus; et al.; Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: II. Discovery of two new GW Vir stars: TIC 333432673 and TIC 095332541; EDP Sciences; Astronomy and Astrophysics; 655; A27; 11-2021; 1-12
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/212384
dc.description.abstract
Context. The Transiting Exoplanet Survey Satellite (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. Aims. In this paper, 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 identify them as two new GW Vir stars, TIC 333432673 and TIC 095332541. We apply the tools of asteroseismology with the aim of deriving their structural parameters and seismological distances. Methods. We carried out a spectroscopic analysis and a spectral fitting of TIC 333432673 and TIC 095332541. 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 PG 1159 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. We employed the individual observed periods to search for a representative seismological model. Results. The analysis of the TESS light curves of TIC 333432673 and TIC 095332541 reveals the presence of several oscillations with periods ranging from 350 to 500 s associated to typical gravity (g)-modes. From follow-up ground-based spectroscopy, we find that both stars have a similar effective temperature (Teff = 120 000 ± 10 000 K) and surface gravity (log g = 7.5 ± 0.5), but a different He/C composition of their atmosphere. On the basis of PG 1159 evolutionary tracks, we derived a spectroscopic mass of M⋆ = 0.58−0.08+0.16 M⊙ for both stars. Our asteroseismological analysis of TIC 333432673 allowed us to find a constant period spacing compatible with a stellar mass M⋆ ∼ 0.60 − 0.61 M⊙, and an asteroseismological model for this star with a stellar mass M⋆ = 0.589 ± 0.020 M⊙, as well as a seismological distance of d = 459−156+188 pc. For this star, we find an excellent agreement between the different methods to infer the stellar mass, and also between the seismological distance and that measured with Gaia (dGaia = 389−5.2+5.6 pc). For TIC 095332541, we have found a possible period spacing that suggests a stellar mass of M⋆ ∼ 0.55 − 0.57 M⊙. Unfortunately, we have not been able to find an asteroseismological model for this star. Conclusions. Using the high-quality data collected by the TESS space mission and follow-up spectroscopy, we have been able to discover and characterize two new GW Vir stars. The TESS mission is having, and will continue to have, an unprecedented impact on the area of white-dwarf asteroseismology.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ASTEROSEISMOLOGY
dc.subject
STARS: EVOLUTION
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STARS: INTERIORS
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STARS: OSCILLATIONS
dc.subject
WHITE DWARFS
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: II. Discovery of two new GW Vir stars: TIC 333432673 and TIC 095332541
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-09-19T13:09:12Z
dc.journal.volume
655
dc.journal.number
A27
dc.journal.pagination
1-12
dc.journal.pais
Francia
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dc.journal.ciudad
París
dc.description.fil
Fil: Uzundag, Murat. European Southern Observatory Chile; Chile. Universidad de Valparaíso; Chile
dc.description.fil
Fil: Corsico, Alejandro Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
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Fil: Kepler, S. O.. Universidade Federal do Rio Grande do Sul; Brasil
dc.description.fil
Fil: Althaus, Leandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
dc.description.fil
Fil: Werner, Klaus. Eberhard Karls Universität Tübingen; Alemania
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Fil: Reindl, N.. Universitat Potsdam; Alemania
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Fil: Bell, K.J.. University of Washington; Estados Unidos
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Fil: Higgins, M.. University of Duke; Estados Unidos
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Fil: Da Rosa, G.O.. Universidade Federal do Rio Grande do Sul; Brasil
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Fil: Vučković, M.. Universidad de Valparaíso; Chile
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Fil: Istrate, A.. Radboud Universiteit Nijmegen; Países Bajos
dc.journal.title
Astronomy and Astrophysics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1051/0004-6361/202141253
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/full_html/2021/11/aa41253-21/aa41253-21.html
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