Santiago Triana

Tight asteroseismic constraints on core overshooting and diffusive mixing in the slowly rotating pulsating B8.3V star KIC 10526294

KIC 10526294 is a very slowly rotating and slowly pulsating late B-type star. Its 19 consecutive dipole gravity modes constitute a series with almost constant period spacing. This unique collection of identified modes probes the near-core environment of this star and holds the potential to reveal the size and structure of the overshooting zone on top of the convective core, as well as the mixing properties of the star. We pursue forward seismic modelling based on adiabatic eigenfrequencies of equilibrium models for eight extensive evolutionary grids tuned to KIC 10526294, by varying the initial mass, metallicity, chemical mixture, and the extent of the overshooting layer on top of the convective core. We examine models for both OP and OPAL opacities and test the occurrence of extra diffusive mixing. We find a tight mass, metallicity relation within the ranges

Inertial waves driven by differential rotation in a planetary geometry

M

THE INTERNAL ROTATION PROFILE OF THE B-TYPE STAR KIC 10526294 FROM FREQUENCY INVERSION OF ITS DIPOLE GRAVITY MODES

~ 3.13 to 3.25 Msun and

KIC 10526294: a slowly rotating B star with rotationally split, quasi-equally spaced gravity modes

Z

Bi-stability in turbulent, rotating spherical Couette flow

~ 0.014 to 0.028. We deduce that an exponentially decaying diffusive core overshooting prescription describes the seismic data better than a step function formulation and derive a value of

Excitation of inertial modes in an experimental spherical Couette flow.

f_{ov}

A turbulent, high magnetic Reynolds number experimental model of Earth's core

between 0.017 and 0.018. Moreover, the inclusion of extra diffusive mixing with a value of

Driven inertial waves in spherical Couette flow

\log D_{\rm mix}

Internal rotation of 13 low-mass low-luminosity red giants in the Kepler field

between 1.75 and 2.00 dex (with

Characterization of the magnetorotational instability from a turbulent background state

D_{\rm mix}