2011A&A...526A..91F


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.17CET09:36:34

2011A&A...526A..91F - Astronomy and Astrophysics, volume 526A, 91-91 (2011/2-1)

Generation of longitudinal flux tube waves in theoretical main-sequence stars: effects of model parameters.

FAWZY D.E. and CUNTZ M.

Abstract (from CDS):

We compute the wave energy fluxes carried by longitudinal tube waves along vertically oriented thin magnetic fluxes tubes embedded in the atmospheres of theoretical main-sequence stars based on stellar parameters deduced by Kurucz and Gray. In addition, we present a fitting formula for the wave energy flux based on the governing stellar and magnetic parameters. A modified theory of turbulence generation based on the mixing-length concept is combined with the magneto-hydrodynamic equations to numerically account for the wave energies generated at the base of magnetic flux tubes. The results indicate a stiff dependence of the generated wave energy on the stellar and magnetic parameters in principal agreement with previous studies. The wave energy flux FLTW decreases by about a factor of 1.7 between G0 V and K0 V stars, but drops by almost two orders of magnitude between K0 V and M0 V stars. In addition, the values for FLTW are significantly higher for lower in-tube magnetic field strengths. Both results are consistent with the findings from previous studies. Our study complements existing descriptions of magnetic energy generation in late-type main-sequence stars. Our results will be helpful for calculating theoretical atmospheric models for stars of different levels of magnetic activity.

Abstract Copyright:

Journal keyword(s): methods: numerical - magnetohydrodynamics (MHD) - stars: chromosphere - stars: magnetic field - stars: solar-type - waves

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 530 0
2 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1742 0
3 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 865 1
4 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1110 0

    Equat.    Gal    SGal    Ecl

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2019.11.17-09:36:34

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