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Table 3
Evolution of the [O iii] 5007 Å line flux in the low-excitation PNe labeled in Fig. 1.
| Name | Diam [arcsec] | Date | Flux | Slit [′′] | Date | Flux | Slit [′′] | Date | Flux | Slit [′′] | Notes |
|
|
|||||||||||
| H-rich central stars | |||||||||||
| H 2-25 | 4.4(1)3.55(3) | 2013-07-21 | 84.8 | 2 | 2012-08-21 | 95.3 | 1.5 | 2001-05-20 | 75.5 | 2 | sys? |
| 1984-04-30 | 58 | 4 × 4 | |||||||||
| H 2-48 | 2(1) | 2013-07-22 | 145 | 2 | 2002-06-10 | 113 | 2 | 1985-07-31 | 63 | 4 × 4 | |
| Hb 12 | 1(1)10.12(3) | 2013-09-06 | 512 | 4 | 1996/1999 | 515 | 5 | 1986-07-29 | 468.1 | 4 × 4 | B[e]? WN7? |
| Hen 2-140 | 2.6(1),4.1(2) | 2013-07-21 | 53 | 2 | 1984-04-27 | 44 | 4 × 4 | ||||
| Hen 2-78 | 3(1) | 2013-07-22 | 40 | 2 | 1984-04-29 | 36 | 4 × 4 | ||||
| Hen 2-260 | < 10(1)1.93(3) | 2012-05-29 | 7.9 | 1 | 2012-05-07 | 7.8 | 1.5 | 2001-07-12 | 5.1 | 2 | O |
| Hu 2-1 | 2.6(1)10.34(3) | 2013-09-06 | 439 | 4 | 2001-08 | 428.8 | 1 | 1986-08-01 | 468 | 4 × 4 | |
| M 1-11 | 0(1)5.2 × 5.1(2)2.07(3) | 2013-11-09 | 20.6 | 2 | 2007-02 | 18 | 2 | 1992/1993 | 11.1 | 1.5 × 3.4 | emission line |
| 1986-01-18 | 10 | 4 × 4 | 1986-01-09 | 7.9 | 8 | ||||||
| M 1-12 | 0(1)4.35(3) | 2013-12-26 | 28.3 | 2 | 2007-02 | 25 | 2 | 1992/1993 | 20.6 | 1.5 × 3.4 | emission line |
| 1986-01-18 | 15 | 4 × 4 | 1978-10-10 | 13 | 1 | ||||||
| M 1-26 | 4.2(1),6.4 × 6(2)5.13(3) | 2013-07-21 | 111 | 2 | 1984-04-30 | 55 | 4 × 4 | B[e]? Of(H) | |||
| NGC 6833 | 2(1)0.82(3) | 2013-09-06 | 674 | 4 | 1986-07-29 | 730 | 4 × 4 | Of | |||
| wels | |||||||||||
| Cn 3-1 | 4.5(1)5.7 × 4.6(2) | 2009-05-17 | 22.5 | 4 | 2001-08 | 21.41 | 1 | 1988-06-16 | 22 | 4 × 7.7 | wels |
| IC 4997 | 1.6(1)7.2(3) | 2013-09-07 | 703 | 4 | 1986-07-12 | 437.0 | 4 × 4 | wels | |||
| M 1-30 | < 5(1) | 2010-06-06 | 183 | 1 | 1986-07-12 | 153 | 4 × 4 | wels | |||
| WR central stars | |||||||||||
| BD+ 303639 | 7.5(1) | 2013-09-06 | 7.61 | 4 | 1988-06-18 | 9 | 4 × 7.7 | [WC9] | |||
| Hen 2-142 | 3.6(1),4.2 × 3.1(2) | 2013-07-21 | 7.3 | 2 | 1983-05-03 | 7 | 4 × 4 | 1978-04-26 | 15 | 1.8 | [WC9] |
| M 1-32 | 7.6(1)9.1 × 8.0(2) | 2010-06-06 | 526 | 1 | 1986-07-29 | 398 | 4 × 4 | [WC4]pec | |||
| M 1-51 | 9.5(1) | 2004-08 | 840 | 5 | 1985-07-27 | 533 | 4 × 4 | [WO4]pec | |||
| M 1-6 | < 5(1),5.76(3) | 2007-02 | 130 | 2 | 1986-01-18 | 122 | 4 × 4 | [WC10-11]? | |||
| SwSt 1 | < 5(1),5.6 × 5.2(2) | 2013-07-21 | 24.3 | 2 | 1986-07-13 | 35 | 4 × 4 | [WC9]pec | |||
Notes. The spectral types are given by Weidmann & Gamen (2011).
Reference. (1) Acker et al. (1992); (2) Tylenda et al. (2003); (3) Sahai et al. (2011).
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