On the acoustic flux of Sirius A

Details On the acoustic flux of Sirius A On the acoustic flux of Sirius A

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..550f&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 15, 1981, p. 550-556. Research supported by the Natural Sciences and Engineering

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40

Acoustic Propagation, Convective Flow, Heat Flux, Main Sequence Stars, Stellar Coronas, X Ray Sources, Atmospheric Heating, Mixing Length Flow Theory, Stellar Envelopes, Stellar Temperature

Scientific paper

Acoustic fluxes generated in the superficial convection zones of lower main-sequence stars are estimated. The results are shown to be very sensitive to the assumed convective efficiency of the mixing-length theory. In the case of Sirius A, the uncertainties actually bracket the minimum acoustic flux needed to heat a corona. Models of Sirius A that are both consistent with this minimum flux and the Am nature of its spectral type can be obtained. It is suggested that the recent Einstein soft X-ray detection of Sirius A could possibly be explained in terms of emission from an acoustically-heated corona surrounding that star. Other main-sequence stars could also generate more acoustic energy than is generally believed.

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