Acoustic heating of the chromosphere and cool corona in the F star alpha Canis Minoris (Procyon)

Details Acoustic heating of the chromosphere and cool corona in the F star alpha Canis Minoris (Procyon) Acoustic heating of the chromosphere and cool corona in the F star alpha Canis Minoris (Procyon)

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435..435m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 435, no. 1, p. 435-448

Computer Science

Sound

28

Atmospheric Heating, Atmospheric Models, Chromosphere, F Stars, Hydrodynamics, Sound Waves, Stellar Coronas, Stellar Models, Atomic Spectra, Emission Spectra, Lyman Alpha Radiation, Lyman Spectra, Magnesium, Mathematical Models, Radiative Heat Transfer

Scientific paper

We report on a hydrodynamical model of acoustic wave energy deposition in the atmosphere of the F star Procyon. The model treats radiative losses in the photosphere by solving the continuum radiative transfer (RT) problem; it treats radiative losses in the chromosphere by solving the RT equation in two representative strong lines (Mg II k and Lyman alpha); and it includes optically thin emission from the corona. We find a temperature minimum of 4440 K and a transition region at a height of 3500-4000 km above the photosphere. Our acoustic model accounts for the reported fluxes of Mg II and Lyman alpha emission lines, as well as for the X-ray flux from the cool (T less than 1 MK) coronal component reported by Lemen et al. (1989). The differential emission measure distribution in our model agrees quite well with empirical results of Jordan et al. (1986).

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