Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt..........r&link_type=abstract
PhD Thesis, Faculty for Physics and Astronomy of the Friedrich-Schiller-University, Jena-Germany.
Astronomy and Astrophysics
Astronomy
3
Star Formation, Radiative Transfer, Class 0 Sources, Submillimeter, Radio Astronomy, Sky Surveys (Astronomy), Radio Sources (Astronomy), Spectral Energy Distribution
Scientific paper
The work carried out in this Ph.D. thesis concerned the study about thermal dust emission of the circumstellar envelopes of a sample of Class 0 sources. In particular, the physical structure (geometry, radial intensity profile, spatial temperature, and spectral energy distribution) and properties (mass, size, bolometric luminosity and temperature, and age) of Class 0 sources are derived here in an evolutionary context. This is perfomed by combining SCUBA imaging at 450 and 850 μm of the thermal dust emission of envelopes of Class 0 sources in the Perseus and Orion molecular cloud complexes with a spherical model of the envelope, with the implementation of techniques like the blackbody fitting and radiative transfer calculations of dusty envelopes, and with an evolutionary model for protostars.
Source-by-source comparisons of observed spectral energy distributions with those modelled ones, and of observed radial profiles with those simulated ones indicate that a simple spherical symmetric model envelope, and the assumptions about density and dust distributions following the standard envelope model are reasonable approachs.
The implications of the derived properties for protostellar evolution are illustrated by analysis of the Lbol, the Tbol, and the power-law index p of the density distribution for a sample of Class 0 sources.
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