===== Detection of Magnesium Hydride Isocyanide, HMgNC, toward CW Leonis =====

After charaterization of its rotational spectrum by Fourier microwave spectroscopy, magnesium hydride isocyanide, or hydridomagnesium isocyanide, HMgNC, was identified in the circumstellar envelope of the late-type carbon-rich star CW Leonis, also known as IRC +10216 by\\
C. Cabezas, J. Cernicharo, J. L. Alonso, M. Agúndez, S. Mata, M. Guélin, and I. Peña,\\
**[[https://doi.org/10.1088/0004-637X/775/2/133|Laboratory and Astronomical Discovery of HydroMagnesium Isocyanide]]**\\
//Astrophys. J.// **775**, Art. No. 133 (2013).\\
Five rotational transitions, //J"// = 7 to 9 and 11 and 12 were observable in theory between 87 and 143 GHz in the course of a molecular line survey carried out with the IRAM 30 m radiotelecope on Pico Veleta, Spain. //J"// = 7 and 9 were seen with reasonable signal-to-noise ratio. //J"// = 8 was fully overlapped, and //J"// = 11 and 12 were overlapped in part, but could be included in the analysis. The rotational temperature of around 21 K is similar to that of MgNC and maybe slightly warmer than that of MgCN. Its column density is slightly smaller than that of MgCN, and much smaller, by a factor of about 20, than that of MgNC.


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Contributor(s): H. S. P. Müller; 09, 2013

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