Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...220..185g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 220, no. 1-2, Aug. 1989, p. 185-196.
Astronomy and Astrophysics
Astrophysics
18
Mira Variables, Radiative Transfer, Shock Wave Propagation, Stellar Atmospheres, Hydrogen, Numerical Integration, Propagation Velocity, Shock Fronts
Scientific paper
A stationary radiative shock wave model is discussed which takes into account the coupling between the precursor and the wake regions. The model considers only physical conditions found in cool stellar atmospheres, and it is limited to the Lyman radiative flux. It is found that a large fraction of the shock energy is used to photodissociate the molecular hydrogen, and that the shock front velocity is much larger when molecules are present than in a purely atomic medium. The results can explain the high-velocity discontinuity deduced from the observation of fluorescent lines in Mira stars, the high value of the shock front velocity in Mira stars, and why helium emission is never observed in Mira stars.
David Peter P.
Gillet Denis
Lafon Jean-Pierre J.
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