Computer Science – Sound
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....58l...9f&link_type=abstract
Astronomy and Astrophysics, vol. 58, no. 1-2, June 1977, p. L9-L12.
Computer Science
Sound
19
Atmospheric Heating, Sound Waves, Stellar Atmospheres, Stellar Radiation, White Dwarf Stars, X Ray Sources, Coronas, Hydrogen, Optical Thickness, Stellar Envelopes, Stellar Models
Scientific paper
It has been proposed that an acoustically heated corona around Sirius B is responsible for the soft X-ray emission observed from that system, and the energy flux required to heat the corona has been computed under the assumption of a homogeneous envelope consisting of almost pure helium. In this letter, a hydrogen-rich model of Sirius B is computed in the gray approximation. The results show that the changed outer boundary conditions produced by introducing even very small amounts of hydrogen on top of the helium-rich envelope lead to a severe reduction in the extent of the helium convection zone together with a corresponding decline in the generated acoustic-noise output. Consequently, the predicted acoustic fluxes are found to fall well short of the minimum energy requirements for heating the corona. The changes in outer boundary conditions resulting from considering a thin hydrogen-rich envelope are attributed to the much larger atmospheric opacity of hydrogen.
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