Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..387..255h&link_type=abstract
Massive Star Formation: Observations Confront Theory ASP Conference Series, Vol. 387, proceedings of the conference held 10-14 S
Astronomy and Astrophysics
Astronomy
7
Scientific paper
We study the evolution of accreting protostars with high accretion rates of dot{M} ˜ 10^{-4} - 10^{-3} M_&sun;/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 dot{M} ˜ 10^{-6} - 10^{-5} M_&sun;/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.
Hosokawa Takashi
Omukai Kazuyuki
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