The outcome of accretion on to a fully convective star Expansion or contraction?

Statistics – Computation

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Cataclysmic Variables, Convection, Stellar Evolution, Stellar Mass Accretion, Computational Astrophysics, Stellar Luminosity, Stellar Models, Stellar Temperature

Scientific paper

The authors perform evolutionary calculations of a 0.2 M_sun; fully convective star accreting matter at a rate M, ranging from 10-1M_sun;yr-1 to 10-10M_sun;yr-1, until the amount of mass accumulated reaches 2.5×10-3M_sun;. They assume the star to gain energy through accretion at a rate αGMM/R, with α ranging from 0.001 to 0.5. They find that the final models may be divided into three main groups according to their response to accretion. For low Mor low α (Group A) the star remains fully convective and contracts upon accretion. For high α and high M(Group C) the star expands rapidly and in some cases becomes dynamically unstable. In the intermediate range of Mand α (Group B) the outer radius of the star grows, although the interior contracts slowly.

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