# Testing the cores of first ascent red-giant stars using the period spacing of g modes

Nadège Lagarde, Diego Bossini, Andrea Miglio, Mathieu Vrard, Benoit Mosser

Research output: Contribution to journalLetterpeer-review

16 Citations (Scopus)

## Abstract

In the context of the determination of stellar properties using asteroseismology, we study the influence of rotation and convective-core overshooting on the properties of red-giant stars. We used models in order to investigate the effects of these mechanisms on the asymptotic period spacing of gravity modes ($\Delta \Pi_1$) of red-giant stars that ignite He burning in degenerate conditions (M$\lesssim$2.0 M$_{\odot}$). We also compare the predictions of these models with Kepler observations. For a given $\Delta\nu$, $\Delta \Pi_1$ depends not only on the stellar mass, but also on mixing processes that can affect the structure of the core. We find that in the case of more evolved red-giant-branch (RGB) stars and regardless of the transport processes occurring in their interiors, the observed $\Delta \Pi_1$ can provide information as to their stellar luminosity, within ~10-20%. In general, the trends of $\Delta \Pi_1$ with respect to mass and metallicity that are observed in Kepler red-giant stars are well reproduced by the models.
Original language English Royal Astronomical Society. Monthly Notices 14 Jan 2016 https://doi.org/10.1093/mnrasl/slv201 Published - 21 Mar 2016

### Bibliographical note

5pages, 6 figures

• astro-ph.SR

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