Turbulence variations for the three Cepheids SV Vul, X Cyg, and Delta CEP

Details Turbulence variations for the three Cepheids SV Vul, X Cyg, and Delta CEP Turbulence variations for the three Cepheids SV Vul, X Cyg, and Delta CEP

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...111..224b&link_type=abstract

Astronomy and Astrophysics, vol. 111, no. 2, July 1982, p. 224-228. Research supported by the Swiss National Science Foundation

Astronomy and Astrophysics

Astrophysics

46

Cepheid Variables, Kinetic Energy, Spectral Line Width, Stellar Rotation, Stellar Spectra, Turbulence, Pulsars, Radial Velocity, Spectral Correlation, Supergiant Stars

Scientific paper

The spectral line broadening can be deduced from the profile of the correlation function of the scanner CORAVEL. An investigation of the correlation profile of the cepheids (SV Vul, X Cyg, Delta Cep) reveals a strong variation of the line width with the pulsation phase. These variations probably result from a strong variation of turbulence during pulsation. The variation of the kinetic energy contained in the turbulent motions is not negligible in relation to the kinetic energy of the pulsation. These turbulence variations can affect the estimations of the cepheid radii according to the Baade-Wesselink method.

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