Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.335s&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
Ammonia has been found to exists in circumstellar envelopes of evolved stars in amounts that exceed predictons of the current chemical models. In the framework of the HIFISTARS Herschel Guaranteed Time Key Project a number of sources was observed with the HIFI instrument. We report observations of the ground-state rotational transitions NH_3 J_K = 1_0 -- 0_0 transition near 572.5 GHz toward a sample of 7 carbon-rich AGB stars. Clear emissions have been detected in envelopes of 6 objects, including earlier detection in IRC+10216. We present results of the non-LTE radiative transfer modelling conducted with the goal to derive NH3 abundances. The model of ammonia includes IR radiative pumping via ν_2=1 vibrational band at 10 μm.
HIFISTARS Consortium
Neufeld David A.
Schmidt Mirek R.
Siódmiak Natasza
Szczerba Ryszard
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