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. 1999 May 11;96(10):5366–5371. doi: 10.1073/pnas.96.10.5366

Table 9.

Comparison of abundances

Element NGC 6537
KB* Sun
OUR FAKC
He 0.131 0.189 0.11 0.1
C 2.08(−5) 4.0(−5) 6.48(−4) 3.55(−4)
N 9.92(−5) 8.9(−4) 1.40(−4) 9.33(−5)
O 1.42(−4) 1.7(−4) 4.93(−4) 7.41(−4)
Ne 4.81(−5): 1.25(−4) 1.17(−4)
S 2.99(−5) 8.08(−6) 1.62(−5)
Ar 4.00(−6) 2.42(−6) 3.98(−6)
Cl 2.78(−7) 1.66(−7) 3.88(−7)
Ca 1.28(−7) 2.29(−6)
K 1.20(−7) 1.35(−7)
Si 8.89(−6) 3.55(−5)

X(−Y) implies X × 10Y. OUR, The current estimates based on the model; FAKC, Feibelman et al. (15). :, Uncertainty estimated ≥50%. 

*

Average nebular abundances by Kingsburgh and Barlow (22). 

Grevesse and Noels (23). 

Average abundances by Aller and Czyzak (27).