Constants of apsidal motion and calculations of stellar evolution

Details Constants of apsidal motion and calculations of stellar evolution Constants of apsidal motion and calculations of stellar evolution

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995azh....72..924p&link_type=abstract

Astronomicheskij Zhurnal, vol. 72, p. 924

Astronomy and Astrophysics

Astronomy

4

Binary Stars, Stellar Evolution, Stellar Motions, Apsides, Density Distribution, Red Giant Stars, Stellar Systems, Stellar Structure, Stellar Mass

Scientific paper

The velocity of the periastron's motion caused by the mutual tidal distortion of the components of a close binary system depends on the constants k2 of the apsidal motion which characterize the density distribution in each of the components. Results are presented of the calculation of the evolutionary changes of k2 and k2R exp 5 (where R is the star's radius) up to the red-giant stage. The dependences of these parameters on the mass and the age of a star are obtained. The condition defining the position of the star surface strongly affects the k2 value and, insignificantly, the product k2R exp 5. The parameter k2 is sensitive to the structure of the star's shell. The main contribution to k2R exp 5 is provided by layers with a mass coordinate of about 0.9 of the star's mass.

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