The partial ionisation zone of heavy elements in F-stars: a study on how it correlates with rotation
arXiv:1906.12308 · doi:10.1093/mnras/stz1804
Abstract
We study the relation between the internal structures of 10 benchmark main-sequence F-stars and their rotational properties. Stellar rotation of main-sequence F-type stars can be characterised by two distinct rotational regimes. Early-type F-stars are usually rapid rotators with periods typically below 10 days, whereas later-type F-stars have longer rotation periods. Specifically, and since the two rotational regimes are tightly connected to the effective temperatures of the stars, we investigate in detail the characteristics of the partial ionisation zones in the outer convective envelopes of these stars, which in turn, depend on the internal temperature profiles. Our study shows that the two rotational regimes might be distinguished by the relative locations of the partial ionisation region of heavy elements and the base of the convective zone. Since in all these stars is expected a dynamo-driven magnetic field where the shear layer between convective and radiative zones (tachocline) plays an important role, this result suggests that the magnetic field may be related to the combined properties of convection and ionisation.
14 pages, 10 figures, 3 tables, Accepted for publication in MNRAS
References in corpus (23)
- The Transiting Exoplanet Survey Satellite
- The K2 Mission: Characterization and Early results
- Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
- On the Origin of Cosmic Magnetic Fields
- Slowing the Spins of Stellar Cores
- Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
- A spin-down clock for cool stars from observations of a 2.5-billion-year-old cluster
- Improved angular momentum evolution model for solar-like stars II. Exploring the mass dependence
- Calibrating Gyrochronology using Kepler Asteroseismic targets
- On differential rotation and overshooting in solar-like stars
- An asteroseismic signature of helium ionization
- Stellar Winds on the Main-Sequence I: Wind Model
- The influence of metallicity on stellar differential rotation and magnetic activity
- A Revised Prescription for the Tayler-Spruit Dynamo: Magnetic Angular Momentum Transport in Stars
- Magnetic Field Generation in Stars
- Stellar magnetic activity and variability of oscillation parameters - An investigation of 24 solar-like stars observed by Kepler
- Seismic measurement of the locations of the base of convection zone and helium ionization zone for stars in the {\it Kepler} seismic LEGACY sample
- Numerical simulations of quiet Sun magnetic fields seeded by Biermann battery
- A semi-empirical model for magnetic braking of solar-type stars
- Predicting the Rossby number in convective experiments
- The CoRoT target HD49933: a possible seismic signature of heavy elements ionization in the deep convective zone
- A Theoretical Study of the Outer Layers of Eight Kepler F-stars: The Relevance of Ionization Processes
- Measuring Solar Abundances with Seismology