Acoustically heated chromospheres of late-type stars.

Details Acoustically heated chromospheres of late-type stars. Acoustically heated chromospheres of late-type stars.

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ahcl.book.....b&link_type=abstract

Acoustically heated chromospheres of late-type stars., by Buchholz, B.. Heidelberg Univ. (Germany). Naturwissenschaftlich-Mathe

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The author has calculated time dependent models of acoustically heated chromospheres for main sequence stars of spectral types F0 V to M4 V and for two giant stars of spectral types K0 III and K5 III. The equations of hydrodynamics together with the equation of radiative transfer (RTE) are solved in order to investigate the propagation of acoustic waves into chromospheric regions. A new computational method has been developed which is able to solve the RTE on the very irregular depth grids resulting from the presence of shock discontinuities in the computational domain. Molecular opacities of TiO and water vapor have been included to get realistic models for the coolest M-dwarfs. The emergent radiation of the Mg II h+k and Ca II H+K lines has been calculated and compared with observations. The results strongly support the idea that the basal non-magnetic heating mechanism for stellar chromospheres is due to the dissipation of acoustic wave energy.

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