Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.161f&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
Theory predicts, and observations confirm, that the column density ratio between a molecule containing D and its counterpart containing H can be used as an evolutionary tracer in the low-mass star formation process. We have investigated whether this result can be applied to the high-mass regime. With the IRAM-30m telescope, we have observed rotational transitions of N_2H^+ and N_2D^+ and derived the deuterated fraction in a sample of 28 cores within massive star-forming regions believed to represent different evolutionary stages of the massive star formation process. Our results clearly indicate that the abundance of N_2D^+ is higher at the pre-stellar/cluster stage, then drops during the formation of the protostellar object(s) as in the low-mass regime, and remains relatively constant during the formation of the Ultra-Compact HII region. These findings suggest that the abundance of N_2D^+ is an evolutionary indicator also in massive star formation.
Butler Michael J.
Caselli Paola
Fontani Francesco
Jiménez-Serra Izaskun
Palau Aina
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