Spectral Appearance of a 1 M_{⊙} Protostar
Abstract
Results are presented for calculations of the emission spectrum of a onesolarmass protostar, using a computer program which combines a numerical solution to the problem of nongrey radiative transfer in the extended protostellar atmosphere with a certain hydrodynamic code. In the calculations, LTE conditions are assumed, scattering is neglected, the gas and dust are assumed to have the same temperature, and the dust opacity is assumed to have an inverse powerlaw dependence on wavelength. The spectral energy distribution of the protostar is plotted and described for the optically thick and optically thin phases of collapse. The spectral sequence clearly shows the emergence of a stellar spectrum and also the gradual disappearance of the IR peak as a result of the gradual depletion of dust in the envelope. The results yield a very broad spectral energy distribution, such as is observed in T Tauri stars.
 Publication:

Mitteilungen der Astronomischen Gesellschaft Hamburg
 Pub Date:
 1976
 Bibcode:
 1976MitAG..38..162B
 Keywords:

 Nongray Atmospheres;
 Protostars;
 Radiative Transfer;
 Stellar Atmospheres;
 Stellar Spectra;
 Computer Programs;
 Optical Thickness;
 Spectrum Analysis;
 Stellar Mass;
 T Tauri Stars;
 Thermodynamic Equilibrium;
 Astronomy