Table 1.
Summary of [Cl iii] observations
| Object | Observation date | I(5518 Å) | I(5538 Å) | I(8434 Å) | I(8481 Å) | I(8500 Å) | C* |
|---|---|---|---|---|---|---|---|
| NGC 2440 | Nov. 18, 1989 | 5.40−1 | 6.21−1 | — | — | 9.00−2 | 0.53 |
| NGC 6537 | June 15, 1992 | 3.85−1 | 9.16−1 | 1.91−2 | — | — | 1.80 |
| NGC 6572 | Aug. 5, 1990 | 1.58−1 | 3.75−1 | 1.50−2 | 1.70−2 | 2.10−2 | 0.40 |
| NGC 6572 | Sept. 1, 1991 | 1.70−1 | 3.97−1 | 2.10−2 | 2.40−2 | 3.10−2 | 0.40 |
| NGC 6741 | Sept. 30, 1991 | 6.32−1 | 1.02+0 | 3.80−2 | 6.40−2 | — | 1.10 |
| NGC 6884 | Aug. 30, 1994 | 2.73−1 | 4.99−1 | 4.50−2 | — | — | 1.10 |
| NGC 7009 | July 27, 1988 | 2.97−1 | 4.08−1 | 2.90−2 | 2.50−2 | — | 0.08 |
| NGC 7027 | Sept. 4, 1987 | 1.67−1 | 6.37−1 | 8.60−2 | 7.10−2 | 8.60−2 | 1.37 |
| NGC 7662 | Aug. 28, 1988 | 2.70−1 | 3.35−1 | — | 5.70−2 | — | 0.10 |
| IC 2165 | Nov. 17, 1989 | 3.30−1 | 3.70−1 | — | 3.00−2 | 4.00−2 | 0.68 |
| IC 4997 | Aug. 3, 1990 | 4.60−2 | 1.20−1 | 1.50−2 | 2.00−2 | 1.70−2 | 0.80 |
| IC 4997 | Aug. 30, 1991 | 6.10−2 | 1.31−1 | 1.30−2 | 3.30−2 | 2.80−2 | 0.80 |
| Hubble 12 | Aug. 6, 1990 | 5.00−2 | 1.35−1 | 6.00−2 | 6.20−2 | 6.40−2 | 1.35 |
Line intensities I (in energy units), corrected for interstellar extinction, are given relative to I(Hβ) = 100. A ± B implies A × 10±B.
*
Interstellar extinction coefficient C = 1.47E(B − V) = log[Ii(Hβ)/Io(Hβ)], where Ii(Hβ) and Io(Hβ) are the intrinsic and observed Hβ line intensities, respectively.