MHD Wave Energy Fluxes Generated from Convection Zones of Late Type Stars

Details MHD Wave Energy Fluxes Generated from Convection Zones of Late Type Stars MHD Wave Energy Fluxes Generated from Convection Zones of Late Type Stars

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jkas...24..129m&link_type=abstract

Journal of the Korean Astronomical Society, vol. 24, no. 1, p. 129-149

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An attempt has been made to examine the characteristics of acoustic and MHD waves generated in stellar convection zones (4000K <= Teff <= 7000K, 3 <= log g <= 4.5). With the use of wave generation theories formulated for acoustic waves by Stein (1967), for MHD body waves by Musielak and Rosner (1987, 1988) and for MHD tube waves by Musielak et al. (1989a, 1989b), the energy fluxes are calculated and their dependence on effective temperature, surface gravity and magnetic field strength are analyzed by optimization techniques. In computing magneto-convection models, the effect of magnetic fields on the efficiency of convection has been taking into account by extrapolating it from Yun's sunspot models (1968; 1970). Our study shows that acoustic wave fluxes are dominant in F and G stars, while the MHD waves dominant in K and M stars, and that the MHD wave fluxes vary as Teff^4 ~ Teff^7 in contrast to the acoustic fluxes, as Teff^10. The gravity dependence, on the other hand, is found to be relatively weak; the acoustic wave fluxes ~~ g^-0.5, the longitudinal tube wave fluxes ~~ g^-0.3 and the transverse tube wave fluxes ~~ g^0.3. In the case of the MHD body waves their gravity dependence is found to be nearly negligible. Finally we assessed the computed energy fluxes by comparing them with the observed fluxes F_ob f CIV (ramda 1549) lines and soft X-rays for selected main sequence stars. When we scaled the corrected wave fluxes down to F_ob, it is found that these slopes are almost in line with each other.

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