Shock waves and microturbulence in RR Lyrae

Details Shock waves and microturbulence in RR Lyrae Shock waves and microturbulence in RR Lyrae

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...344..930f&link_type=abstract

Astronomy and Astrophysics, v.344, p.930-934 (1999)

Astronomy and Astrophysics

Astrophysics

11

Shock Waves, Turbulence, Stars: Individual: Rr Lyr, Stars: Oscillations, Stars: Variables: Rr Lyr

Scientific paper

A time variation of the microturbulence velocity vturb in the atmosphere of RR Lyrae is estimated from a comparison of the observed and theoretical FWHM curves of the Fe II 4923.921 Angstroms absorption line. The theoretical line profiles were obtained using a hydrodynamical RR Lyrae model, discussed in Fokin & Gillet (1997). The estimated value of the vturb varies from 2 to 7 km/s, with a maximum at the phase 0.7. The dominant increase of the vturb seems to be caused by a strong shock, propagating through the line formation region and producing compression of the turbulent gas. Indeed, according to the current theories of the shock/turbulence interaction, the mean density increases, such as revealed by the model, should lead to a certain turbulence enhancement. Yet, the detailed mechanism of such an amplification is to be clarified.

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