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Paper: Evolution of Massive Protostars with High Accretion Rates
Volume: 387, Massive Star Formation: Observations Confront Theory
Page: 255
Authors: Hosokawa, T.; Omukai, K.
Abstract: We study the evolution of accreting protostars with high accretion rates of dM/dt ∼ 10−4 − 10−3M/yr, which are envisaged in some scenarios of massive star formation. Detailed properties of the protostar are investigated by solving the stellar structure equations. Our calculations show that the evolution with a high accretion rate is fairly different from that with a lower rate. The radius of the protostar is very large, and the ignition of the nuclear reaction is delayed with the high accretion rate. The protostar also remains radiative even after the deuterium burning begins. These properties are similar to those of primordial protostars, rather than present-day low- and intermediate-mass protostars, for which lower accretion rates of dM/dt ∼ 10−6−10−5M/yr are expected. We find the causes of these differences by calculating protostellar evolution with various accretion rates. Finally, we discuss the validity of a one-zone polytrope model from our numerical results.
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