Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : IV. Discovery of two new GW Vir stars : TIC 0403800675 and TIC 1989122424
dc.contributor.author | Uzundag, Murat | pt_BR |
dc.contributor.author | Córsico, Alejandro Hugo | pt_BR |
dc.contributor.author | Kepler, Souza Oliveira | pt_BR |
dc.contributor.author | Althaus, Leandro Gabriel | pt_BR |
dc.contributor.author | Werner, Klaus | pt_BR |
dc.contributor.author | Reindl, Nicole | pt_BR |
dc.contributor.author | Vuckovic, Maja | pt_BR |
dc.date.accessioned | 2022-06-25T05:02:58Z | pt_BR |
dc.date.issued | 2022 | pt_BR |
dc.identifier.issn | 0035-8711 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/241011 | pt_BR |
dc.description.abstract | We present two new GW Vir-type pulsating white dwarf stars, TIC 0403800675 (WD J115727.68-280349.64) and TIC 1989122424 (WD J211738.38-552801.18) discovered in the Transiting Exoplanet Survey Satellite (TESS) photometric data. For both stars, the TESS light curves reveal the presence of oscillations with periods in a narrow range between 400 and 410 s, which are associated with typical gravity (g)-modes. Follow-up ground-based spectroscopy shows that both stars have similar effective temperature (Teff = 110 000 ± 10 000 K) and surface gravity (log g = 7.5 ± 0.5), but different He/C composition (mass fractions): He = 0.75 and C = 0.25 for TIC 0403800675, and He = 0.50 and C = 0.50 for TIC 1989122424. By performing a fit to their spectral energy distributions, we found for both stars radii and luminosities of R = 0.019 ± 0.002 R and log(L/L ) = 1.68+0.15 −0.24, respectively. By employing evolutionary tracks of PG 1159 stars, we find the masses of both stars to be 0.56 ± 0.18 M from the log g-Teff diagram and 0.60+0.11 −0.09 M from the Hertzsprung Russell diagram. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Monthly notices of the royal astronomical society. Oxford. Vol. 513, no. 2 (Maio 2022), p. 2285-2291 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Stars : Evolution | en |
dc.subject | Anãs brancas | pt_BR |
dc.subject | Evolucao estelar | pt_BR |
dc.subject | Stars : Interiors | en |
dc.subject | Stars : Oscillations (including pulsations) | en |
dc.subject | Pulsacoes estelares | pt_BR |
dc.subject | White dwarfs | en |
dc.title | Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : IV. Discovery of two new GW Vir stars : TIC 0403800675 and TIC 1989122424 | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001142637 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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