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Evidence of structural discontinuities in the inner core of red-giant stars

Author

Listed:
  • Mathieu Vrard

    (Universidade do Porto, CAUP
    The Ohio State University)

  • Margarida S. Cunha

    (Universidade do Porto, CAUP)

  • Diego Bossini

    (Universidade do Porto, CAUP)

  • Pedro P. Avelino

    (Universidade do Porto, CAUP
    Universidade do Porto)

  • Enrico Corsaro

    (INAF - Osservatorio Astrofisico di Catania)

  • Benoît Mosser

    (PSL Research University, CNRS, Sorbonne Université, Université Paris Diderot)

Abstract

Red giants are stars in the late stages of stellar evolution. Because they have exhausted the supply of hydrogen in their core, they burn the hydrogen in the surrounding shell . Once the helium in the core starts fusing, the star enters the clump phase, which is identified as a striking feature in the color-magnitude diagram. Since clump stars share similar observational properties, they are heavily used in astrophysical studies, as probes of distance, extinction through the galaxy, galaxy density, and stellar chemical evolution. In this work, we perform the detailed observational characterization of the deepest layers of clump stars using asteroseismic data from Kepler. We find evidence for large core structural discontinuities in about 6.7% of the stars in our sample, implying that the region of mixing beyond the convective core boundary has a radiative thermal stratification. These stars are otherwise similar to the remaining stars in our sample, which may indicate that the building of the discontinuities is an intermittent phenomenon.

Suggested Citation

  • Mathieu Vrard & Margarida S. Cunha & Diego Bossini & Pedro P. Avelino & Enrico Corsaro & Benoît Mosser, 2022. "Evidence of structural discontinuities in the inner core of red-giant stars," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34986-z
    DOI: 10.1038/s41467-022-34986-z
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    References listed on IDEAS

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    1. Timothy R. Bedding & Benoit Mosser & Daniel Huber & Josefina Montalbán & Paul Beck & Jørgen Christensen-Dalsgaard & Yvonne P. Elsworth & Rafael A. García & Andrea Miglio & Dennis Stello & Timothy R. W, 2011. "Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars," Nature, Nature, vol. 471(7340), pages 608-611, March.
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