Skip to main content
. Author manuscript; available in PMC: 2019 Jul 19.
Published in final edited form as: Astron Astrophys. 2019 May 29;625:A147. doi: 10.1051/0004-6361/201935164

Table 2. Direct isotopic ratios.

Ratio L483 TMC-1 L1521E L1521B L134N L1544 B1-b L1527
12C/13C

C17O/13C17O 42 ± 13
C2H/13CCH >162 >250 a 210 ± 60 b
C2H/C13CH >70 >170 a 140 ± 40 b
c-C3H2/c-HCC13CH ×2 106 ± 32 82 ± 16 b
c-C3H2/c-HC13CCH 458 ± 138 200 ± 30 b
c-C3HD/c-H13CCCD 112 ± 34
c-C3HD/c-HCC13CD 87 ± 26
CH3CCH/13CH3CCH 60 ± 18
CH3CCH/CH313CCH 53 ± 16
CH3CCH/CH3C13CH 58 ± 17
CH2DCCH/13CH2DCCH 22 ± 7
HC15N/H13C15N 34 ± 10
H15NC/H15N13C 29 ± 9
HC3N/H13CCCN 91 ± 27 79 ± 11 c 117 ± 16 d 61 ± 9 d 86.4 ± 1.6 e
HC3N/HC13CCN 93 ± 28 75 ± 10 c 117 ± 16 d 94 ± 26 d 85.4 ± 1.7 e
HC3N/HCC13CN 79 ± 24 55 ± 7 c 76 ± 6 d 46 ± 9 d 64.2 ± 1.1 e
DC3N/DC13CCN 30 ± 9
HNCO/HN13CO 62 ± 19
C34S/13C34S 58 ± 18
H2CS/H213CS 113 ± 34 79 ± 26 f
C2S/C13CS 28 ± 8 54 ± 5 g 51 ± 13 g
C2S/13CCS >25 230 ± 130 g >130 g

14N/15N

H13CN/H13C15N 321 ± 96
HC3N/HC315N 490 ± 147 257 ± 54 h 400 ± 20 i
N2H+/15NNH+ >747 1110 ± 240 j >600 k
N2H+/N15NH+ >450 670230+150 l 1050 ± 220 j 40065+100 j

16O/18O

HNCO/HNC18O 232 ± 70
SO/S18O 158 ± 47

16O/17O

SO/S17O 128 ± 38

32S/34S

13CS/13C34S 31 ± 9
H2CS/H2C34S 29 ± 9
C2S/C234S 17 ± 5
SO/34SO 31 ± 9
SO2/34SO2 31 ± 9
NS/N34S 22 ± 7
HCS+/HC34S+ 21 ± 6

32S/33S

SO/33SO 151 ± 45