An Interferometric 270--355 GHz Spectral Line Survey of the Red Supergiant VY CMa

Details An Interferometric 270--355 GHz Spectral Line Survey of the Red Supergiant VY CMa An Interferometric 270--355 GHz Spectral Line Survey of the Red Supergiant VY CMa

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280e..37m&link_type=abstract

The Molecular Universe, Proceedings of the 280th Symposium of the International Astronomical Union held in Toledo, Spain, May 30

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We have used the Submillimeter Array to image the molecular line emission in the circumstellar envelope of the peculiar red supergiant star VY Canis Majoris over the whole 870 μm atmospheric window. Employing adaptive calibration using the object's continuum emission we achieve high quality one arcsecond resolution imaging of the whole 280--355 GHz range within which we find 211 distinct spectral lines from 33 molecules (including isotopologues) plus 40 unidentified lines. From the distribution of molecules we are obtaining their abundances and isotopologic abundance ratios. Using data for multiple transitions in a number of molecules we are deriving the physical conditions in the circumstellar envelope to reach a picture of the star's chemistry that can be compared with models. Our legacy survey is accompanied by a strong laboratory effort that helps with the identification of possibly newly found molecules traced by unidentified lines. We shall create a publicly accessible database of spectral-line channel-maps of the emission from all the lines detected in the survey.

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