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. Author manuscript; available in PMC: 2021 May 5.
Published in final edited form as: Astrophys J Lett. 2021 Jan 29;907(2):L39. doi: 10.3847/2041-8213/abd102

Table 1.

Isotopic Data of Clusters Found with DB4 and DB5

Cluster DB4 N Types 12C/13C
 14N/15N
 δ29Si/28Si (‰)
 δ30Si/28Si (‰)
 26Al/27Al
 Si Isotope Correlationa
Mean Std Dev Mean Std Dev Mean Std Dev Mean Std Dev Mean Std Dev R2 F Intercept Std Error Slope Std Error p Value
1 229 100% MS 51 6 1080 804 76 45 68 35 0.91 2271    −7.2   2   1.22 0.03 <2e–16
2 34 62% AB 38% N 6 3 59 39 26 42 82 59 0.23 9    −1.9 11   0.34 0.11 4E–03
3 220 70% MS 26% Y 4% Z 73 42 1995 1518 22 44 45 30 0.71 528  −34.5    2.9   1.26 0.06 <2e–16
4 110 91% X 9% N 788 1424 67 59 −394 163 −389 273 0.1 12 −321 26   0.19 0.05 8.E–04
5 166 99.4% X 0.6% AB 283 288 75 29 −244 84 −371 118 0.92 1975     11   6   0.69 0.02 <2e–16
6 154 100% AB 4 2 351 346 43 64 40 44 0.91 1456  −12.8    2.2   1.39 0.04 <2e–16
7 139 98.6% AB 1.4% MS 7 2 2133 1912 26 38 33 28 0.35 75      0.21   4   0.8 0.09 1E–14
8 63 71% Z19% Y 5% MS 3% X 2% AB 82 55 1542 2439 −64 79 118 118 0.07 5   −12.7   13.8 −0.18 0.08 4E–02
9 239 99% MS 1% Y 68 11 1859 1331 46 24 49 19 0.84 1247   −12.2    1.8   1.19 0.03 <2e–16
DB5
1b 70 100% MS 61 13 2496 1194 58 45 55 32 0.0005 0.0003 0.9 637   −15   3   1.34 0.05 <2e–16
2 12 75% N 25% AB 6 3 49 37 14 32 109 39 0.06 0.06 0.23 3   −28.6   25.9   0.39 0.22 0.12
3 69 67% MS 28% Y 3% AB 3% Z 71 60 1839 1553 30 34 47 39 0.002 0.004 0.24 21       9.8    5.8   0.43 0.09 9e–10
4 23 61% X 22% N 9% AB 9% MS 133 324 187 385 −274 323 −214 333 0.09 0.12 0.09 2 −211  79   0.3 0.2 0.16
5 56 100% X 176 126 75 30 −263 100 −358 106 0.19 0.11 0.62 87      4.6   29.8   0.75 0.08 8e–13
6 100 98% AB 2% Z 5 3 383 459 33 57 42 40 0.004 0.004 0.67 199   −16.5    4.9   1.18 0.08 <2e–16
7 21 100% AB 6 1.8 2950 2068 23 34 26 35 0.003 0.003 0.28 8       9.6    8   0.5 0.2 0.013
8 26 92% MS 8% Z 56 13 686 213 27 73 22 58 0.0009 0.0004 0.32 11     11.7   13   0.71 0.21 3e–3
10 25 100% X 1283 763 47 25 −374 86 −531 89 0.24 0.14 0.09 2 −216 104   0.3 0.19 0.14

Notes.

a

Statistical results of the linear regression of their δ29,30Si isotopic ratios.

b

Clusters in DB4 and DB5 were named similarly based on the co-occurrence of similar grains in each of the two considered clusters. Clusters c9DB4 and c10DB5 are named differently because they do not have corresponding clusters in DB5 and DB4, respectively.