Using the phase shift to asymptotically characterize the dipolar mixed modes in post-main-sequence stars

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    C. Jiang, School of Physics and Astronomy, Sun Yat-sen University, 2 Daxue Road, Tangjia, Zhuhai 519082, Guangdong Province, China, Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, P-4150-762 Porto, Portugal 0000-0002-7614-1665,
  • J. Christensen-Dalsgaard
  • M. Cunha, Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal
Mixed modes have been extensively observed in post-main-sequence stars by the Kepler and CoRoT space missions. The mixture of the p and g modes can be measured by the dimensionless coefficient q, the so-called coupling strength factor. In this paper, we discuss the utility of the phase shifts θ from the eigenvalue condition for mixed modes as a tool to characterize dipolar mixed modes from the theoretical as well as the practical point of view. Unlike the coupling strength, whose variation in a given star is very small over the relevant frequency range, the phase shifts vary significantly for different modes. The analysis in terms of θ can also provide a better understanding of the pressure and gravity radial order for a given mixed mode. Observed frequencies of the Kepler red-giant star KIC 3744043 are used to test the method. The results are very promising.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume474
Issue number4
Pages (from-to)5413-5424
ISSN0035-8711
DOIs
Publication statusPublished - 1 Mar 2018

    Research areas

  • stars: interiors, stars: oscillations, stars: solar-type

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