SIMBAD references

2004A&A...419L..35B - Astronomy and Astrophysics, volume 419, L35-38 (2004/6-1)

Disappearance of N2H+ from the gas phase in the class 0 protostar IRAM 04191.


Abstract (from CDS):

We present a high-resolution millimeter study of the very young class 0 protostar IRAM 04191+1522 in the Taurus molecular cloud. N2H+(1-0) observations with the IRAM Plateau de Bure Interferometer and 30 m telescope demonstrate that the molecular ion N2H+ disappears from the gas phase in the inner part of the protostellar envelope (r<1600AU, nH2>5x105cm^-3). This result departs from the predictions of current chemical models. It suggests either that N2 is more depleted than the models predict, owing to a higher binding energy on polar ice or an enhanced grain chemistry transforming N2 to less volatile species, or that strong deuterium fractionation enhances N2D+ to the detriment of N2H+.

Abstract Copyright:

Journal keyword(s): stars: formation - circumstellar matter - stars: individual: IRAM 04191+1522 - ISM: abundances - astrochemistry - stars: rotation

Simbad objects: 6

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