Absolute and relative amplitudes of variations in radius of classical cepheids

  title={Absolute and relative amplitudes of variations in radius of classical cepheids},
  author={Ts. G. Tsvetkov},
  journal={Astrophysics and Space Science},
  • T. Tsvetkov
  • Published 1 December 1988
  • Physics
  • Astrophysics and Space Science
On the basis of observational data for the absolute ΔR and relative ΔR/R amplitudes of variations in radius of galactic classical cepheids (55 stars from Balona and Stobie (1979) and 30 stars from Sollazzoet al. (1981)), four kinds of empirical linear relations are obtained: log(P ΔV)−logΔR, logP−logΔR, log(P ΔV)−log(ΔR/R), and logP−log(ΔR/R);P, R, and ΔV are the pulsation periods, the mean stellar radii, and the amplitudes of light variations, respectively. Three groups of stars are considered… 
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