Mathematics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934409l&link_type=abstract
American Astronomical Society, AAS Meeting #219, #344.09
Mathematics
Scientific paper
The evolutionary status of MWC 349A - the unique source of hydrogen maser and laser radiation arising in a massive circumstellar disk - is still a matter of debate. One way to shed light on this issue would be to measure the isotopic composition of the disk. We performed computer simulations of the chemical composition of the disk using the package CLOUDY (Ferland et al. 1998). The best agreement between the calculated hydrogen line strength ratios and those measured by Hamann and Simon (1986) was achieved for a model with a central (black body) star of T ≈ 20,000 K and a disk with the inner radius 1014 cm, hydrogen density at the inner radius 108 cm-3 and the r-2 drop of density with radius. We present the column densities predicted by CLOUDY for observed (CO) and several not yet observed molecules containing the major isotopes of C, N, O and discuss the prospects of detecting and measuring the radio lines of these molecules and their isotopologues with existing and forthcoming facilities. This project was supported by NSF/REU grant AST-0851892, the Presidential Award for Excellence in Science, Mathematics and Engineering Mentoring, and the Nantucket Maria Mitchell Association.
Bans Alissa
Lagergren Kristen
Strelnitski Vladimir
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