Evolution model for substellar objects

Details Evolution model for substellar objects Evolution model for substellar objects

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007arep...51..605p&link_type=abstract

Astronomy Reports, Volume 51, Issue 8, pp.605-614

Astronomy and Astrophysics

Astronomy

2

97.10.Cv, 97.20.Vs, 97.21.+A

Scientific paper

A new model for the evolution of substellar objects is proposed, which enables computation of their internal structure and evolution in an adiabatic approximation without allowance for axial rotation, magnetic fields, and nuclear reactions. The basic set of differential equations in the model contains a new equation for the gradient of the electron degeneracy parameter and adiabatic coefficients of the new type. The results of numerical simulations of evolutionary sequences of hydrogen (X = 1), helium (Y = 1), and hydrogen-helium (X = 0.75, Y = 0.25) substellar objects with masses M < 0.08 M &sun; during the evolutionary stage 106 yr < t < 1010 yr are reported. Luminosity-effective temperature, mass-radius, radius-time, central temperature-central density, and central temperature-age relations are analyzed for the indicated chemical composition.

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