Results 21 to 30 of about 42,668 (331)
Towards a holistic magnetic braking model from the evolution of cataclysmic variables to stellar spin-down -- I: the spin-down of fully convective M-dwarfs [PDF]
, 2023 We extend a magnetic braking (MB) model, which has been used earlier to address the evolution of cataclysmic variables, to address the spin period $P_\mathrm{spin}$ evolution of fully convective M dwarf (FCMD) stars. The MB mechanism is an $\alpha-\Omega$
Arnab Sarkar, L. Yungelson, C. Tout
semanticscholar +1 more source
PARSEC V2.0: Stellar tracks and isochrones of low and intermediate mass stars with rotation [PDF]
Astronomy & Astrophysics, 2022 We present a new comprehensive collection of stellar evolutionary tracks and isochrones for rotating low- and intermediate-mass stars assembled with the updated version of PARSEC V2.0. This version includes our recent calibration of the extra mixing from
C. Nguyen +8 more
semanticscholar +1 more source
Rotation in stellar interiors: General formulation and an asteroseismic-calibrated transport by the Tayler instability [PDF]
Astronomy & Astrophysics, 2022 Context: Asteroseismic measurements of the internal rotation of evolved stars indicate that at least one unknown efficient angular momentum (AM) transport mechanism is needed in stellar radiative zones.
P. Eggenberger, F. Moyano, J. Hartogh
semanticscholar +1 more source
A Transparent Window into Early-type Stellar Variability [PDF]
Astrophysical Journal, 2022 Subsurface convection zones are ubiquitous in early-type stars. Driven by narrow opacity peaks, these thin convective regions transport little heat but play an important role in setting the magnetic properties and surface variability of stars.
A. Jermyn, E. H. Anders, M. Cantiello
semanticscholar +1 more source
Magnetic Archaeology of Early-type Stellar Dynamos [PDF]
Astrophysical Journal, 2021 Early-type stars show a bimodal distribution of magnetic field strengths, with some showing very strong fields (≳1 kG) and others very weak fields (≲10 G).
A. Jermyn, M. Cantiello
semanticscholar +1 more source
On the proper use of the Schwarzschild and Ledoux criteria in stellar evolution computations [PDF]
, 2014 The era of detailed asteroseismic analyses opened by space missions such as CoRoT and $\textit{Kepler}$ has highlighted the need for stellar models devoid of numerical inaccuracies, in order to be able to diagnose which physical aspects are being ignored
Gabriel, Maurice +3 more
core +2 more sources
Hunting for giant cells in stellar convection zones [PDF]
Astrophysical Dynamics: from Stars to Galaxies, IAU Symposium 271, 2010 Abstract3D high resolution simulations for the convective zone of a 4Myr old 0.7 M⊙ pre-main sequence star in gravitational contraction are carried out with different radial density contrast using the pseudo spectral ASH code (Brun et al. 2004). We extract giant cells signal from the complex surface convective patterns by using a wavelet analysis.
Bessolaz & Brun, A.S.
openaire +2 more sources
Convection Zones in Stellar Atmospheres.
The Astrophysical Journal, 1962 In following the evolution of stars to the cooler regions of giants in the H-R diagram, core solutions are fitted with the atmospheric solutions; this parameter is the constant that joins the pressure and temperature at the end of the ionization zone. The distribution of this parameter in the H-R diagram was studied by computing atmospheric models. The
K. S. Krishna Swamy, R. S. Kushwaha
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Torsional magnetic tube waves in stellar convection zones [PDF]
Astronomy & Astrophysics, 2003 An analytic approach to the generation of torsional magnetic tube waves in stellar convection zones is presented. The waves are produced in a thin, vertically oriented magnetic flux tube embedded in a magnetic field-free, turbulent and compressible external medium and are excited by external turbulent flows.
M. W. Noble +2 more
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One Zone Modeling of Irregular Variability of Stellar Convective Envelope [PDF]
International Astronomical Union Colloquium, 1993 AbstractOne zone modeling of the irregular variability of red super-giants is intended with regard to the nonlinear coupling of finite amplitude pulsation with convection. The nonlocal mixing length is employed for the evaluation of the convective flux, the turbulent pressure and the turbulent power of temperature fluctuations. The radial pulsation and
Unno, W., Xiong, D.-R.
openaire +1 more source