Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.8408w&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #84.08; Bulletin of the American Astronomical Society, Vol. 26, p.1457
Astronomy and Astrophysics
Astronomy
Scientific paper
We present OVRO Millimeter Wave Array, NRAO 12m, and MWO 4.9m measurements of the 111 -> 101 transition of ortho-NH_2D toward the L1689N molecular cloud. These measurements indicate that the L1689N core contains at least two solar masses of material at a temperature near 8 K. The oblong structure of the NH_2D emission, several thousand AU in extent, lies roughly parallel to the ammonia disk enveloping IRAS16293-2422, about 16000 AU to the east. Any dust core embedded within the molecular core contains less than a few percent of the total molecular mass. From scales of one to ten thousand AU, the temperature and column density of NH_2D appear to remain constant. The extent of deuterium fractionation in NH_3 suggests that the core temperature has varied little, at least over the past several thousand years.
Mangum Jeffrey G.
Wootten Al
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