Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..541b&link_type=abstract
Astronomy and Astrophysics, Vol. 277, NO. 2/OCT(I), P. 541, 1993
Astronomy and Astrophysics
Astrophysics
12
Stars: Variables: Cepheids - Line: Profiles - Turbulence - Shock Waves - Stars: Individual: Η Aquilae, S Sagittae
Scientific paper
In this second paper of this series we study the effect of the well-known resonance of the fundamental and the second overtone pulsation mode on the turbulence. Thus, we observed high resolution spectra of the classical cepheid stars η Aquilae and S Sagittae at two different spectral domains, one including Hα and the other one including the sodium D lines. We find that for both stars the resonance delays the compression of the stellar atmosphere so that the increase of turbulence caused by this compression occurs nearly at the same time as the strong rise of turbulent velocity υturb due to the acceleration front propagating outward. This explains why no standstill can be seen in the ascending branch of the υrot curve as it is the case for & δ Cephei.
Breitfellner M. G.
Gillet Denis
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