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5 results

  • On the possible directions of evolutionary trends of stars in the Hertzsprung-Russel diagram

  • V. Krat
  • Journal: Symposium - International Astronomical Union / Volume 10 / 1959
  • Published online by Cambridge University Press: 14 August 2015, pp. 121-124
  • Print publication: 1959
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  • The evolution of a star depends on the initial conditions existing during its formation and on the course of the main processes changing its chemical composition and mass. If it is assumed that stars are formed from diffuse matter, the initial conditions are restricted to three factors: 1) mass, 2) chemical composition, 3) angular momentum. The mass of the star can be determined by the conditions of gravitational instability of diffuse matter, which, according to our hypothesis, consisted of solid primary bodies, similar to cometary nuclei, and a gas and dust nebula formed by them. The upper limit for the possible mass of a star is evidently determined by its angular momentum, which cannot exceed a certain critical value.

  • Non-Stability in Close Binary Stars

  • V. A. Krat
  • Journal: Symposium - International Astronomical Union / Volume 3 / 1957
  • Published online by Cambridge University Press: 14 August 2015, pp. 159-164
  • Print publication: 1957
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  • Those eclipsing binaries whose components are non-stable stars deserve particular attention not only owing to the fact that in such cases the physical properties of the stars may be studied in greater detail, but also since the mechanism of the ejection of gases from the atmospheres of the components may then be established with some certainty.