Model of Dusty Envelope of ETA Carinae

Extract

Eta Carinae is a well-known example of a star with a massive circumstellar nebulous shell. The shell is regarded as a remnant of a great outburst of the star in the last century. η Car parameters remain to be a matter of scientific debates: most often investigators revise stellar temperature T, mass loss rate , the velocity of outflow V. We have worked out several numerical evolutionary models of η Car envelope (the homunculus) paying attention to the dependence on the mentioned parameters. The dependence on the parameters of grain evolution was also considered. For a representative model we fixed: V=500km/s; M=10⁻¹ M_⊙/y during the first 15 years of the outburst and slowly decreasing in time, T=20000K. A coupled two-components hydrodynamical and radiation model transfer problem has been solved.