Evolution of Close Binaries of Shorter Period and Moderate Mass

Details Evolution of Close Binaries of Shorter Period and Moderate Mass Evolution of Close Binaries of Shorter Period and Moderate Mass

Mar 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968ap%26ss...1..239p&link_type=abstract

Astrophysics and Space Science, Volume 1, Issue 2, pp.239-263

Astronomy and Astrophysics

Astrophysics

10

Scientific paper

Evolution of close binaries is investigated in which the more massive component has a mass of 5m&sun; and reaches the Roche limit when hydrogen is burning in its convective core. It is shown that a large-scale mass transfer occurs, during which the initial primary develops into a contact subgiant or giant, and the mass ratio is reversed or more than reversed. Although the process and its outcome depend on the initial conditions, in particular on the degree of chemical inhomogeneity in the interior of the primary component, the picture of evolution is essentially the same. We can distinguish and describe quantitatively the following phases: (1) Premain-sequence contraction, when the less massive component is an undersize subgiant. (2) Both components are on the main sequence. (3) Rapid mass exchange, when the roles of the components are interchanged. (4) Slow mass transfer, when the system is semi-detached; this phase is typical for the Algol-like binaries. Further evolution depends on the rate of evolution of the components: either we get another phase with an undersize subgiant, or a complicated system in which both stars lose mass. Probabilities of discovery are calculated for the various phases of evolution. The paper is based on the calculations of stellar models with decreasing mass by means of Henyey's method.

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