Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.275..726d&link_type=abstract
Nature, vol. 275, Oct. 26, 1978, p. 726, 727.
Astronomy and Astrophysics
Astronomy
5
Constraints, Stellar Coronas, Stellar Models, White Dwarf Stars, X Ray Sources, Acoustic Propagation, Stellar Envelopes, Stellar Evolution, Stellar Temperature, X Ray Astronomy
Scientific paper
It has been proposed that the soft X-ray emission from Sirius is due to an acoustically heated corona around the white dwarf Sirius B. If it is accepted that the corona is due to the dissipation of acoustic flux produced in subatmospheric convective layers, then for Sirius B to have a corona there must be an He-convective region beneath the atmospheric H-layers. If historical records are accurate, it is very possible that Sirius B went through a pseudo-red giant phase a few thousand years ago. The sudden expansion of the envelope of a white dwarf is always related to H burning, which can occur only if the H envelope of the white dwarf is large, and the expansion for a few thousand years is never able to completely remove this envelope. Therefore, if the historical record is true, the H envelope of Sirius B is orders of magnitude larger than the envelope required for He convection to survive, and the corona model is wrong.
Dantona F.
Mazzitelli Irene
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