Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393..232l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. 232-257.
Astronomy and Astrophysics
Astrophysics
8
Bremsstrahlung, Photosphere, Protostars, Star Formation, Stellar Mass Accretion, Entropy, Hydrogen, Optical Thickness, Shock Fronts, Stellar Models
Scientific paper
Low rates of accretion (less than 10 exp -10 solar masses/yr) of metal-free gas onto a small (less than 0.15 solar masses) protostellar core allow efficient cooling of the settling gas and yield very degenerate interior conditions. The steady-state, spherically symmetric flow near such a protostar is modeled. The calculations include a shock which stands above the stellar surface, a cooling region in which bremsstrahlung is the dominant radiative mechanism, an absorption layer just above the protostellar surface in which ionizing radiation is reprocessed, and a settling region in which the newly accreted material cools and joins the hydrostatic atmosphere of the protostar. In addition, there exists an external H II-like region in the preshock region. The transition between degenerate and nondegenerate conditions is a strong function of both mass and accretion rate. Opacity in the outer layers is primarily due to collision-induced absorption. An extensive set of solutions is provided in which a given interior flux is carried by convection at large depths. Some astrophysical implications of accretion at the rates considered are briefly discussed.
Chernoff David F.
Lenzuni Paolo
Salpeter Edwin E.
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