Theoretical stellar chromospheres of late type stars. V - Temperature minimum in the grey LTE approach

Details Theoretical stellar chromospheres of late type stars. V - Temperature minimum in the grey LTE approach Theoretical stellar chromospheres of late type stars. V - Temperature minimum in the grey LTE approach

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....93..178s&link_type=abstract

Astronomy and Astrophysics, vol. 93, no. 1-2, Jan. 1981, p. 178-188. Research supported by the Deutsche Forschungsgemeinschaft.

Computer Science

Sound

21

Atmospheric Heating, Atmospheric Models, Chromosphere, Gray Gas, Late Stars, Sound Waves, Atmospheric Radiation, Atmospheric Temperature, Convective Heat Transfer, Radiant Heating, Temperature Distribution, Thermodynamic Equilibrium

Scientific paper

With the computation of theoretical chromosphere models for a number of stars with effective temperatures from 4000 to 7000 K and logs of gravity 2 to 5, the monochromatic, gray LTE radiation hydrodynamic approach to the acoustic heating theory is brought to its conclusion. Theoretical predictions are compared with observations and rather good agreement is found for the position of the temperature minima, the total chromospheric radiation flux as well as the average effective temperature slope of the Mg II emission. Both theoretical and observed stellar chromospheres fall into two classes denoted S- and R-types. Empirically found temperature enhancement is proposed to be due to the large acoustic wave amplitude and the nonlinearity of the Planck function. The shortcomings of the acoustic heating theory are extensively discussed.

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