Molecular abundances and low-mass star formation. 1: Si- and S-bearing species toward IRAS 16293-2422
1994; IOP Publishing; Volume: 428; Linguagem: Inglês
10.1086/174278
ISSN1538-4357
AutoresGeoffrey A. Blake, Ewine F. van Dishoek, D. J. Jansen, T. D. Groesbeck, Lee G. Mundy,
Tópico(s)Atmospheric Ozone and Climate
Resumoview Abstract Citations (124) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Molecular Abundances and Low-Mass Star Formation. I. Si- and S-bearing Species toward IRAS 16293-2422 Blake, Geoffrey A. ; van Dishoeck, Ewine F. ; Jansen, David J. ; Groesbeck, T. D. ; Mundy, Lee G. Abstract Results from millimeter and submillimeter spectral line surveys of the protobinary source Infrared Astronomical Satellite (IRAS) 16293-2422 are presented. Here we outline the abundances of silicon- and sulfur-containing species. A combination of rotation diagram and full statistical equilibrium/radiative transfer calculations is used to constrain the physical conditions toward IRAS 16293 and to construct its beam-averaged chemical composition over a 10 to 20 sec (1600 to 3200 AU) scale. The chemical complexity as judged by species such as SiO, OCS, and H2S, is intermediate between that of dark molecular clouds such as L134N and hot molecular cloud cores such as Orion KL. From the richness of the spectra compared to other young stellar objects of similar luminosity, it is clear that molecular abundances do not scale simply with mass; rather, the chemistry is a strong function of evolutionary state, i.e., age. Publication: The Astrophysical Journal Pub Date: June 1994 DOI: 10.1086/174278 Bibcode: 1994ApJ...428..680B Keywords: Abundance; Chemical Composition; Interstellar Matter; Molecular Clouds; Molecules; Silicon Compounds; Star Formation; Sulfur Compounds; Emission Spectra; Millimeter Waves; Radiative Transfer; Spectrum Analysis; Submillimeter Waves; Telescopes; Astronomy; STARS: CIRCUMSTELLAR MATTER; ISM: INDIVIDUAL ALPHANUMERIC: IRAS 16293-2422; ISM: ABUNDANCES; ISM: MOLECULES full text sources ADS | data products SIMBAD (9) Related Materials (1) Part 2: 1995ApJ...447..760V
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