Artículo
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
Uzundag, Murat; Corsico, Alejandro Hugo
; Kepler, S. O.; Althaus, Leandro Gabriel
; Werner, Klaus; Reindl, Nicole; Vuckovic, Maja
Fecha de publicación:
06/2022
Editorial:
Oxford University Press
Revista:
Monthly Notices of the Royal Astronomical Society
ISSN:
0035-8711
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
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 - IV. Discovery of two new GW Vir stars: TIC 0403800675 and TIC 1989122424; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 513; 2; 6-2022; 2285-2291
Compartir
Altmétricas