A coupled, dynamical and chemical model for the prestellar core L1544: Comparison of modeled and observed C18O, HCO+, and CS ... View Full Text


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Article Info

DATE

2003-03

AUTHORS

Ya. N. Pavlyuchenkov, B. M. Shustov, V. I. Shematovich, D. S. Wiebe, Zhi-Yun Li

ABSTRACT

We consider radiative transfer in C18O, HCO+, and CS molecular lines in a spherically symmetrical, coupled, dynamical and chemical model of a prestellar core whose evolution is determined by ambipolar diffusion. Theoretical and observed line profiles are compared for the well-studied core L1544, which may be a collapsing protostellar cloud. We study the relationship between the line shapes and model parameters. The structure of the envelope and kinematic parameters of the cloud are the most important factors determining the shape of the lines. Varying the input model parameters for the radiative transfer—the kinetic temperature and microturbulent velocity—within the limits imposed by observations does not result in any substantial variations of the line profiles. The comparison between the model and observed spectra indicates that L1544 displays a flattened structure, and is viewed at an oblique angle. A two-dimensional model is needed to reproduce this structure. More... »

PAGES

176-185

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/1.1562212

DOI

http://dx.doi.org/10.1134/1.1562212

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1007275270


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