2003A&A...403L..25H

Query : 2003A&A...403L..25H

2003A&A...403L..25H - Astronomy and Astrophysics, volume 403L25-28 (2003/5-4)

High NH2D/NH3 ratios in protostellar cores.

HATCHELL J.

Abstract (from CDS):

Observations of low mass protostars which probe small enough size scales to be within likely CO depletion regions show the highest [NH2D]/[NH3] ratios yet measured, of 4-33%. These molecular D/H ratios are higher than those measured on larger scales, showing that deuterium fractionation increases towards protostellar cores. As in cold clouds, such high ratios can be produced by gas-phase ion-molecule chemistry in the presence of depletion. Grain surface chemistry is less likely to explain the deuterium enhancement, as it would require higher fractionation in ices than current models predict. The link between accretion, depletion and high molecular deuterium fractionation is strongly supported.

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Journal keyword(s):

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
2 LDN 1448NW Y*O 03 25 35.66 +30 45 34.2           ~ 80 0
3 [SDA2014] West4 Y*O 03 25 38.83 +30 44 06.2           ~ 266 1
4 IRAS F03226+3033 Y*O 03 25 38.83 +30 44 06.2           ~ 371 0
5 NAME NGC 1333 DCO+ Cld 03 26 06.6 +31 03 08           ~ 4 0
6 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 770 1
7 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 489 0
8 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 625 0
9 IRAS 03282+3035 cor 03 31 20.98 +30 45 30.1           ~ 186 0
10 NAME Per Region reg 03 37 00.0 +31 15 00           ~ 296 0
11 HH 211 Y*O 03 43 56.52 +32 00 52.8           ~ 414 0
12 IRAS 03445+3242 Y*O 03 47 41.603 +32 51 43.79           ~ 215 0
13 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 900 0
14 LDN 1527 DNe 04 39 53 +25 45.0           ~ 689 0
15 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
16 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 965 0
17 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 437 1
18 HH 243 HH 05 32 27.83 +12 53 14.6   17.0       ~ 119 0
19 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 623 0
20 HH 111 HH 05 51 44.207 +02 48 33.87           ~ 418 0
21 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 799 1

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