Mathematics – Logic
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc...12n&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Mathematics
Logic
Scientific paper
We investigate the evolution of cosmological low mass (low virial temperature) clouds and the formation of the first stars. We also estimate the feedback by the first generation stars to the host clouds. First, the `cooling diagram' for low mass objects is shown. We assess the cooling rate taking into account the contribution of Hydrogen molecules, which is not in chemical equilibrium generally, with a simple argument of time scales. The reaction rates and the cooling rate are taken from the recent results by Galli and Palla (1998). Next, we show the simulation of the dynamical collapse of metal free protostellar clouds and formation of protostars. We performed hydrodynamical calculations for spherically symmetric clouds taking account of radiative transfer of the molecular hydrogen lines and the continuum, as well as of chemistry of the molecular hydrogen. The collapse is non-homologous and proceed almost self-similarly like Larson-Penston similarity solution. The effective `adiabatic index' at the center is about 1.1 almost throughout the collapse. The mass accretion rate is estimated to be very large and the massive star formation is expected. Finally, we investigate the feed back by the first generation massive stars. The main feedback consists of two different processes, UV radiation from the stars and energy input by SNe. The feedback from the formed stars on their own host cloud is very serious.
Nishi Ryoichi
Omukai Kazuyuki
Susa Hajime
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