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Molecular abundances and low-mass star formation. I: Si- and S-bearing species toward IRAS 16293-2422

Blake, Geoffrey A. and van Dishoeck, Ewine F. and Jansen, David J. and Groesbeck, T. D. and Mundy, Lee G. (1994) Molecular abundances and low-mass star formation. I: Si- and S-bearing species toward IRAS 16293-2422. Astrophysical Journal, 428 (2). pp. 680-692. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20120912-140817783

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Abstract

Results from millimeter and submillimeter spectral line surveys of the protobinary source 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 10-20" (1600-3200 AU) scale. The chemical complexity as judged by species such as SiO, OCS, and H_2S, is mtermedtate between that of dark molecular clouds such as Ll34N 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/174278DOIUNSPECIFIED
http://adsabs.harvard.edu/abs/1994ApJ...428..680BPublisherUNSPECIFIED
Additional Information:© 1994 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1993 July 21; accepted 1993 December 22. The authors are grateful to John Black for discussions on the excitation of various molecules in this source. G. A. B. would like to acknowledge support from NASA (NAGW -2297), as well as the David and Lucille Packard and Alfred P. Sloan Foundations, while work on astrochemistry in Leiden is supported by a PIONIER grant from the Netherlands Organization for Scientific Research (NWO). L. G. M. would like to acknowledge support from NASA (NAGW-3066).
Funders:
Funding AgencyGrant Number
NASANAGW-2297
David and Lucile Packard FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Netherlands Organization for Scientific Research (NWO) PIONIER grantUNSPECIFIED
NASANAGW-3066
Subject Keywords:circumstellar matter; ISM: abundances; ISM: individual (IRAS 16293-2422); ISM: molecules
Record Number:CaltechAUTHORS:20120912-140817783
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120912-140817783
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34034
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:12 Sep 2012 21:28
Last Modified:26 Dec 2012 16:09

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