SIMBAD references

2007A&A...462..221A - Astronomy and Astrophysics, volume 462, 221-230 (2007/1-4)

The depletion of NO in pre-protostellar cores.

AKYILMAZ M., FLOWER D.R., HILY-BLANT P., PINEAU DES FORETS G. and WALMSLEY C.M.

Abstract (from CDS):

Understanding the depletion of heavy elements is a fundamental step towards determining the structure of pre-protostellar cores just prior to collapse. We study the dependence of the NO abundance on position in the pre-protostellar cores L1544 and L183. We observed the 150GHz and 250GHz transitions of NO and the 93GHz transitions of N2H+ towards L1544 and L183 using the IRAM 30m telescope. We compare the variation of the NO column density with position in these objects with the H column density derived from dust emission measurements. We find that NO behaves differently from N2H+ and appears to be partially depleted in the high density core of L1544. Other oxygen-containing compounds are also likely to be partially depleted in dense-core nuclei. The principal conclusions are that: the prestellar core L1544 is likely to be ``carbon-rich''; the nitrogen chemistry did not reach equilibrium prior to gravitational collapse, and nitrogen is initially (at densities of the order of 104cm–3) mainly in atomic form; the grain sticking probabilities of atomic C, N and, probably, O are significantly smaller than unity.

Abstract Copyright:

Journal keyword(s): molecular processes - stars: formation - dust, extinction - ISM: molecules - ISM: abundances - radio lines: ISM

Simbad objects: 4

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2019.12.06-06:26:14

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