Turbulence variation in the atmosphere of delta Cephei

Details Turbulence variation in the atmosphere of delta Cephei Turbulence variation in the atmosphere of delta Cephei

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...344..935g&link_type=abstract

Astronomy and Astrophysics, v.344, p.935-941 (1999)

Astronomy and Astrophysics

Astrophysics

11

Line: Profiles, Shock Waves, Turbulence, Stars: Individual: Delta Cep, Stars: Variables: Cepheids

Scientific paper

Using 288 high resolution spectra obtained over 3 consecutive years (1993-1995), the microturbulence velocity curve of delta Cephei is determined with a high temporal resolution. From the observed FWHM variation of the unblended Fe I 5576.0883 Angstroms absorption line, and from nonlinear nonadiabatic pulsating models, it is shown that the global compression/expansion of the atmosphere provokes the variation of the turbulence. The turbulent velocity reaches its maximum, of about 7 km s(-1) , at minimum radius, and decreases up to 2 km s(-1) during the expansion of the star. It is also shown that the compression waves and shocks certainly provoke some rapid turbulence variations during their propagation in the atmosphere. The turbulence amplification due to these waves, being in general smaller than the global compression effect, increases with the wave amplitude.

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