Table 7.
Fractional ionic concentration for NGC 6537
| Ion | Lines | Tɛ | Icorr | N(ion) N(H+) |
|---|---|---|---|---|
| He i | 6678 | 17000 | 3.18 | 7.37(−2) |
| 4471 | 4.11 | 8.96(−2) | ||
| 5876 | 13.0 | 6.00(−2) | ||
| He ii | 4686 | 20100 | 112 | 1.00(−1)? |
| 5412 | 8.46 | 5.70(−2) | ||
| C iii | 1907/9 | 18000 | 131 | 9.70(−6) |
| C iv | 1545/51 | 23000 | 313 | 3.30(−6) |
| N i | 5198, 5200 | 6000 | 1.85 | 6.50(−5) |
| N ii | 6548/84,5755 | 12500 | 483 | 4.84(−5) |
| N iii | 1747-54 | 18000 | 105 | 3.02(−5) |
| N iv | 1483/86 | 24000 | 163 | 9.82(−6) |
| N v | 1239/43 | 34000 | 582 | 2.87(−6) |
| O i | 6300/63 | 10800 | 1.15 | 9.93(−7) |
| O ii | 7319/30 | 12700 | 15.1 | 2.62(−5) |
| O iii | 4959, 5007, 4363 | 17700 | 1305 | 7.92(−5) |
| 1666– | 105 | 9.94(−5) | ||
| O iv | 1397-1407 | 25000 | 9.03 | 1.86(−6) |
| Ne iii | 3868, 3967 | 15900 | 141 | 1.87(−5) |
| Ne iv | 4724/6,4714 | 30000 | 6.76 | 4.40(−6) |
| Ne v | 3345/3426 | 40000 | 681* | 1.33(−5) |
| 1575 | 37.5 | 1.49(−5) | ||
| S ii | 6717/31,4068/76 | 6200 | 22.9 | 6.98(−6) |
| S iii | 6312/9069/9532 | 12000 | 121.8 | 3.08(−6) |
| Cl ii | 8580 | 8600 | 0.3† | 4.10(−8) |
| Cl iii | 5517/37 | 14000 | 1.30 | 4.97(−8) |
| Cl iv | 7530/8045 | 23000 | 3.75 | 5.59(−8) |
| Ar iii | 7135, 7751, 5192 | 14200 | 39.02 | 1.26(−6) |
| Ar iv | 4711/40,7263/40+ | 20000 | 37.27 | 7.02(−7) |
| Ar v | 6435,7005 | 25000 | 27.30 | 5.57(−7) |
| Si iii | 1882/92 | 18300 | 54.9 | 8.16(−7) |
| K iv | 6102 | 25000 | 0.875 | 3.99(−8) |
| Ca v | 5309 | 32000 | 0.266 | 1.79(−8) |
X(−Y) implies X × 10−Y. Nɛ = 20,000.
*
From Feibelman, Aller, Keyes, and Czyzak (15).
†
Discarded because of its uncertain intensity.