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dc.contributor.author
Oliveira da Rosa, Gabriela
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Kepler, S. O.
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Corsico, Alejandro Hugo
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Costa, J. E. S.
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Hermes, J. J.
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Kawaler, S. D.
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Bell, Keaton J.
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Montgomery, M. H.
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Provencal, J. L.
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Winget, D. E.
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Handler, G.
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Dunlap, Bart
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Clemens, J. C.
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Uzundag, Murat
dc.date.available
2023-09-08T14:06:36Z
dc.date.issued
2022-09
dc.identifier.citation
Oliveira da Rosa, Gabriela; Kepler, S. O.; Corsico, Alejandro Hugo; Costa, J. E. S.; Hermes, J. J.; et al.; Kepler and TESS Observations of PG 1159-035; IOP Publishing; Astrophysical Journal; 936; 2; 9-2022; 1-21
dc.identifier.issn
0004-637X
dc.identifier.uri
http://hdl.handle.net/11336/210932
dc.description.abstract
PG 1159-035 is the prototype of the PG 1159 hot (pre-)white dwarf pulsators. This important object was observed during the Kepler satellite K2 mission for 69 days in 59 s cadence mode and by the TESS satellite for 25 days in 20 s cadence mode. We present a detailed asteroseismic analysis of those data. We identify a total of 107 frequencies representing 32 ℓ = 1 modes, 27 frequencies representing 12 ℓ = 2 modes, and eight combination frequencies. The combination frequencies and the modes with very high k values represent new detections. The multiplet structure reveals an average splitting of 4.0 ± 0.4 μHz for ℓ = 1 and 6.8 ± 0.2 μHz for ℓ = 2, indicating a rotation period of 1.4 ± 0.1 days in the region of period formation. In the Fourier transform of the light curve, we find a significant peak at 8.904 ± 0.003 μHz suggesting a surface rotation period of 1.299 ± 0.002 days. We also present evidence that the observed periods change on timescales shorter than those predicted by current evolutionary models. Our asteroseismic analysis finds an average period spacing for ℓ = 1 of 21.28 ± 0.02 s. The ℓ = 2 modes have a mean spacing of 12.97 ± 0.4 s. We performed a detailed asteroseismic fit by comparing the observed periods with those of evolutionary models. The best-fit model has T eff = 129, 600 ± 11 100 K, M * = 0.565 ± 0.024M ⊙, and log g = 7.41 − 0.54 + 0.38 , within the uncertainties of the spectroscopic determinations. We argue for future improvements in the current models, e.g., on the overshooting in the He-burning stage, as the best-fit model does not predict excitation for all of the pulsations detected in PG 1159-035.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Pulsating variable stars
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White dwarf stars
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Asteroseismology
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Kepler and TESS Observations of PG 1159-035
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-09-05T18:04:22Z
dc.journal.volume
936
dc.journal.number
2
dc.journal.pagination
1-21
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Oliveira da Rosa, Gabriela. Universidade Federal do Rio Grande do Sul; Brasil
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Fil: Kepler, S. O.. Universidade Federal do Rio Grande do Sul; Brasil
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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: Costa, J. E. S.. Universidade Federal do Rio Grande do Sul; Brasil
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Fil: Hermes, J. J.. Boston University; Estados Unidos
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Fil: Kawaler, S. D.. University of Iowa; Estados Unidos
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Fil: Bell, Keaton J.. University Of Washington; Estados Unidos
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Fil: Montgomery, M. H.. University of Texas at Austin; Estados Unidos
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Fil: Provencal, J. L.. University Of Delaware; Estados Unidos
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Fil: Winget, D. E.. University of Texas at Austin; Estados Unidos
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Fil: Handler, G.. Nicolaus Copernicus Astronomical Center Of The Polish Academy Of Sciences; Polonia
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Fil: Dunlap, Bart. Mcdonald Observatory; Estados Unidos. University of Texas at Austin; Estados Unidos
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Fil: Clemens, J. C.. University of North Carolina; Estados Unidos
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Fil: Uzundag, Murat. Universidad de Valparaíso; Chile
dc.journal.title
Astrophysical Journal
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3847/1538-4357/ac8871
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