Gravity-mode period spacings and near-core rotation rates of 611 γ Doradus stars with Kepler
| Autor: | Rhita-Maria Ouazzani, Gang Li, Timothy Van Reeth, Timothy R. Bedding, Nicholas H. Barbara, Victoria Antoci, Simon J. Murphy |
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| Přispěvatelé: | Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
INSTABILITY
ASTEROSEISMIC MEASUREMENT Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astronomy & Astrophysics Rotation [Stars] Rotation 01 natural sciences Measure (mathematics) MAGNETIC-FIELDS Spectral line stars: rotation 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics MAIN-SEQUENCE 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics [PHYS]Physics [physics] Science & Technology LOW-FREQUENCY OSCILLATIONS 010308 nuclear & particles physics [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] Astronomy and Astrophysics Observable INTERNAL-ROTATION Dipole Stars Amplitude Astrophysics - Solar and Stellar Astrophysics CONVECTION 13. Climate action Space and Planetary Science Physical Sciences Quadrupole DELTA-SCUTI Oscillations [Stars] stars: oscillations Astrophysics::Earth and Planetary Astrophysics CORIOLIS-FORCE VELOCITIES [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, ⟨10.1093/mnras/stz2906⟩ Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, 491 (3), pp.3586-3605. ⟨10.1093/mnras/stz2906⟩ Li, G, Van Reeth, T, Bedding, T R, Murphy, S J, Antoci, V, Ouazzani, R M & Barbara, N H 2020, ' Gravity-mode period spacings and near-core rotation rates of 611 γ Doradus stars with Kepler ', Monthly Notices of the Royal Astronomical Society, vol. 491, no. 3, pp. 3586-3605 . https://doi.org/10.1093/mnras/stz2906 |
| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.1093/mnras/stz2906⟩ |
| Popis: | We report our survey of γ Dor stars from the 4-yr Kepler mission. These stars pulsate mainly in g modes and r modes, showing period-spacing patterns in the amplitude spectra. The period-spacing patterns are sensitive to the chemical composition gradients and the near-core rotation, hence they are essential for understanding the stellar interior. We identified period-spacing patterns in 611 γ Dor stars. Almost every star pulsates in dipole g modes, while about 30% of stars also show clear patterns for quadrupole g modes and 16% of stars present r mode patterns. We measure periods, period spacings, and the gradient of the period spacings. These three observables guide the mode identifications and can be used to estimate the near-core rotation rate. We find many stars are hotter and show longer period-spacing patterns than theory. Using the Traditional Approximation of Rotation (TAR), we inferred the asymptotic spacings, the near-core rotation rates, and the radial orders of the g and r modes. Most stars have a near-core rotation rate around 1 d−1and an asymptotic spacing around 4000 s. We also find that many stars rotate more slowly than predicted by theory for unclear reasons. 11 stars show rotational splittings with fast rotation rates. We compared the observed slope–rotation relation with the theory and find a large spread. We detected rotational modulations in 58 stars and used them to derive the core-to-surface rotation ratios. The interiors rotate faster than the cores in most stars, but by no more than 5%. |
| Databáze: | OpenAIRE |
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